mb/google/myst: Enable CBFS Verification

Enable RO verification by GSC and RO/RW CBFS verification.

BUG=b:277087492
TEST=Build and boot to OS in Myst with CBFS verification enabled using
PSP verstage.

Change-Id: I2dd3ce59f331f89660185309ccf60c53d50e4fad
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/78235
Reviewed-by: Tim Van Patten <timvp@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Eric Lai <ericllai@google.com>
diff --git a/src/mainboard/google/myst/Kconfig b/src/mainboard/google/myst/Kconfig
index fbb3687..70986f8 100644
--- a/src/mainboard/google/myst/Kconfig
+++ b/src/mainboard/google/myst/Kconfig
@@ -88,11 +88,6 @@
 	bool
 	default y if VBOOT && !VBOOT_STARTS_BEFORE_BOOTBLOCK
 
-# TODO(b/277087492): Enable GSC CBFS verification
-config VBOOT_GSCVD
-	bool
-	default n
-
 # Override PSP_SOFTFUSE_BITS from soc/amd/phoenix.
 # The documentation of PSP_SOFTFUSE_BITS is available in #55758 doc (NDA).
 config PSP_SOFTFUSE_BITS