vboot_logic: Set VB2_CONTEXT_EC_TRUSTED in verstage_main

vboot_reference is introducing a new field (ctx) to store the current
boot mode in crrev/c/2944250 (ctx->bootmode), which will be leveraged
in both vboot flow and elog_add_boot_reason in coreboot.

In current steps of deciding bootmode, a function vb2ex_ec_trusted
is required. This function checks gpio EC_IN_RW pin and will return
'trusted' only if EC is not in RW. Therefore, we need to implement
similar utilities in coreboot.

We will deprecate vb2ex_ec_trusted and use the flag,
VB2_CONTEXT_EC_TRUSTED, in vboot, vb2api_fw_phase1 and set that flag
in coreboot, verstage_main.

Also add a help function get_ec_is_trusted which needed to be
implemented per mainboard.

BUG=b:177196147, b:181931817
BRANCH=none
TEST=Test on trogdor if manual recovery works

Signed-off-by: Hsuan Ting Chen <roccochen@chromium.org>
Change-Id: I479c8f80e45cc524ba87db4293d19b29bdfa2192
Reviewed-on: https://review.coreboot.org/c/coreboot/+/57048
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/intel/alderlake/Makefile.inc

@@ -46,6 +46,8 @@ ramstage-y += vr_config.c
 ramstage-y += xhci.c
 ramstage-$(CONFIG_SOC_INTEL_CRASHLOG) += crashlog.c
 
+verstage-y += gpio.c
+
 smm-y += elog.c
 smm-y += gpio.c
 smm-y += p2sb.c

src/soc/intel/apollolake/Makefile.inc

@@ -92,11 +92,13 @@ bootblock-y += gpio_glk.c
 romstage-y += gpio_glk.c
 smm-y += gpio_glk.c
 ramstage-y += gpio_glk.c
+verstage-y += gpio_glk.c
 else
 bootblock-y += gpio_apl.c
 romstage-y += gpio_apl.c
 smm-y += gpio_apl.c
 ramstage-y += gpio_apl.c
+verstage-y += gpio_apl.c
 endif
 
 CPPFLAGS_common += -I$(src)/soc/intel/apollolake/include

src/soc/intel/skylake/Makefile.inc

@@ -20,6 +20,7 @@ bootblock-y += spi.c
 bootblock-y += lpc.c
 bootblock-y += uart.c
 
+verstage-y += gpio.c
 verstage-y += gspi.c
 verstage-y += pmutil.c
 verstage-y += i2c.c