soc/amd/cezanne: Select VBNV_CMOS

Needed so we can switch to normal mode.

BUG=b:184126844
TEST=Boot guybrush in developer mode and switch to normal mode.

Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Change-Id: I26ad160a2372484e9753a727f2b454a31e3537a0
Reviewed-on: https://review.coreboot.org/c/coreboot/+/52224
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>

src/soc/amd/cezanne/Kconfig

@@ -286,4 +286,8 @@ config PSP_WHITELIST_FILE
 
 endmenu
 
+config VBOOT
+	select VBOOT_VBNV_CMOS
+	select VBOOT_VBNV_CMOS_BACKUP_TO_FLASH
+
 endif # SOC_AMD_CEZANNE