mb/emulation/qemu-i440fx|q35: Switch to C_ENVIRONMENT_BOOTBLOCK

Useful for testing stuff in C_ENVIRONMENT_BOOTBLOCK, like
VBOOT with separate verstage.

Changes:
* Use symbols to set up CAR and STACK
* Zero CAR area
* Move BIST failure checking to cpu folder
* Rename functions where necessary

Tested:
* qemu-2.11.2 machine pc
* qemu-2.11.2 machine q35

Test result:
* BIST error reporting is still working.
* Console starts in bootblock
* SeaBios 1.11.2 as payload is still working

Change-Id: Ibf341002c36d868b9b44c8b37381fa78ae5c4381
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: https://review.coreboot.org/29578
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

src/mainboard/emulation/qemu-i440fx/Kconfig

@@ -12,6 +12,7 @@ config BOARD_SPECIFIC_OPTIONS # dummy
 	select BOARD_ROMSIZE_KB_256
 	select MAINBOARD_HAS_NATIVE_VGA_INIT
 	select MAINBOARD_FORCE_NATIVE_VGA_INIT
+	select BOOTBLOCK_CONSOLE
 
 config MAINBOARD_DIR
 	string
@@ -25,12 +26,19 @@ config IRQ_SLOT_COUNT
 	int
 	default 6
 
+# Skip the first 64KiB as coreboot table pointer is installed
+# at address 0
 config DCACHE_RAM_BASE
-	hex
-	default 0xd0000
-
-config DCACHE_RAM_SIZE
 	hex
 	default 0x10000
 
+# Memory at 0xa0000 decodes to VGA
+config DCACHE_RAM_SIZE
+	hex
+	default 0x90000
+
+config C_ENV_BOOTBLOCK_SIZE
+	hex
+	default 0x4000
+
 endif # BOARD_EMULATION_QEMU_X86_I440FX