mb/amd/birman/bootblock.c: Skip EC configuration in SimNow

SimNow does not support the Birman EC, so skip the EC configuration
steps when building for SimNow.

Signed-off-by: Fred Reitberger <reitbergerfred@gmail.com>
Change-Id: I6e879a13a119d593674d3403d4e1b32e0e244d9f
Reviewed-on: https://review.coreboot.org/c/coreboot/+/73166
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>

src/mainboard/amd/birman/bootblock.c

@@ -14,5 +14,6 @@ void bootblock_mainboard_early_init(void)
 
 void bootblock_mainboard_init(void)
 {
-	birman_ec_init();
+	if (!CONFIG(SOC_AMD_COMMON_BLOCK_SIMNOW_BUILD))
+		birman_ec_init();
 }