mrc_cache: Move code for triggering memory training into mrc_cache

Currently the decision of whether or not to use mrc_cache in recovery
mode is made within the individual platforms' drivers (ie: fsp2.0,
fsp1.1, etc.).  As this is not platform specific, but uses common
vboot infrastructure, the code can be unified and moved into
mrc_cache.  The conditions are as follows:

  1.  If HAS_RECOVERY_MRC_CACHE, use mrc_cache data (unless retrain
      switch is true)
  2.  If !HAS_RECOVERY_MRC_CACHE && VBOOT_STARTS_IN_BOOTBLOCK, this
      means that memory training will occur after verified boot,
      meaning that mrc_cache will be filled with data from executing
      RW code.  So in this case, we never want to use the training
      data in the mrc_cache for recovery mode.
  3.  If !HAS_RECOVERY_MRC_CACHE && VBOOT_STARTS_IN_ROMSTAGE, this
      means that memory training happens before verfied boot, meaning
      that the mrc_cache data is generated by RO code, so it is safe
      to use for a recovery boot.
  4.  Any platform that does not use vboot should be unaffected.

Additionally, we have removed the
MRC_CLEAR_NORMAL_CACHE_ON_RECOVERY_RETRAIN config because the
mrc_cache driver takes care of invalidating the mrc_cache data for
normal mode.  If the platform:
  1.  !HAS_RECOVERY_MRC_CACHE, always invalidate mrc_cache data
  2.  HAS_RECOVERY_MRC_CACHE, only invalidate if retrain switch is set

BUG=b:150502246
BRANCH=None
TEST=1. run dut-control power_state:rec_force_mrc twice on lazor
        ensure that memory retraining happens both times
        run dut-control power_state:rec twice on lazor
        ensure that memory retraining happens only first time
     2. remove HAS_RECOVERY_MRC_CACHE from lazor Kconfig
        boot twice to ensure caching of memory training occurred
	on each boot.

Change-Id: I3875a7b4a4ba3c1aa8a3c1507b3993036a7155fc
Signed-off-by: Shelley Chen <shchen@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/46855
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/intel/adlrvp/Kconfig

@@ -25,7 +25,6 @@ config CHROMEOS
 	select GBB_FLAG_FORCE_MANUAL_RECOVERY
 	select GBB_FLAG_DISABLE_PD_SOFTWARE_SYNC
 	select HAS_RECOVERY_MRC_CACHE
-	select MRC_CLEAR_NORMAL_CACHE_ON_RECOVERY_RETRAIN
 
 config MAINBOARD_DIR
 	string
@@ -82,7 +81,6 @@ config VBOOT
 	select VBOOT_LID_SWITCH
 	select VBOOT_MOCK_SECDATA
 	select HAS_RECOVERY_MRC_CACHE
-	select MRC_CLEAR_NORMAL_CACHE_ON_RECOVERY_RETRAIN
 
 config UART_FOR_CONSOLE
 	int

src/mainboard/intel/glkrvp/Kconfig

@@ -45,7 +45,6 @@ config CHROMEOS
 
 config VBOOT
 	select HAS_RECOVERY_MRC_CACHE
-	select MRC_CLEAR_NORMAL_CACHE_ON_RECOVERY_RETRAIN
 	select EC_GOOGLE_CHROMEEC_SWITCHES if GLK_CHROME_EC
 
 config MAINBOARD_DIR

src/mainboard/intel/jasperlake_rvp/Kconfig

@@ -59,7 +59,6 @@ config CHROMEOS
 	select GBB_FLAG_FORCE_MANUAL_RECOVERY
 	select GBB_FLAG_DISABLE_PD_SOFTWARE_SYNC
 	select HAS_RECOVERY_MRC_CACHE
-	select MRC_CLEAR_NORMAL_CACHE_ON_RECOVERY_RETRAIN
 
 config VBOOT
 	select VBOOT_LID_SWITCH

src/mainboard/intel/tglrvp/Kconfig

@@ -31,7 +31,6 @@ config CHROMEOS
 	select EC_GOOGLE_CHROMEEC_SWITCHES if TGL_CHROME_EC
 	select GBB_FLAG_FORCE_MANUAL_RECOVERY
 	select HAS_RECOVERY_MRC_CACHE
-	select MRC_CLEAR_NORMAL_CACHE_ON_RECOVERY_RETRAIN
 	select GBB_FLAG_FORCE_DEV_SWITCH_ON
 	select GBB_FLAG_FORCE_DEV_BOOT_USB
 	select VBOOT_EARLY_EC_SYNC