cezanne/psp_verstage: populate a/b firmware

Build amdfw_[ab] and put them into CBFS. We can reuse FW_[AB] position
from zork since we have same flash layout and size.

Signed-off-by: Kangheui Won <khwon@chromium.org>
Change-Id: Idb31afa7a513f01593b2af75515a170dfca8d360
Reviewed-on: https://review.coreboot.org/c/coreboot/+/52961
Reviewed-by: Raul Rangel <rrangel@chromium.org>
Reviewed-by: Martin Roth <martinroth@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/soc/amd/cezanne/Kconfig b/src/soc/amd/cezanne/Kconfig
index dafc26f..51bc4bc 100644
--- a/src/soc/amd/cezanne/Kconfig
+++ b/src/soc/amd/cezanne/Kconfig
@@ -416,4 +416,22 @@
 	  This is the byte before the default first byte used by VBNV
 	  (0x26 + 0x0E - 1)
 
+if VBOOT_SLOTS_RW_AB && VBOOT_STARTS_BEFORE_BOOTBLOCK
+
+config RWA_REGION_ONLY
+	string
+	default "apu/amdfw_a"
+	help
+	  Add a space-delimited list of filenames that should only be in the
+	  RW-A section.
+
+config RWB_REGION_ONLY
+	string
+	default "apu/amdfw_b"
+	help
+	  Add a space-delimited list of filenames that should only be in the
+	  RW-B section.
+
+endif # VBOOT_SLOTS_RW_AB && VBOOT_STARTS_BEFORE_BOOTBLOCK
+
 endif # SOC_AMD_CEZANNE