soc/amd: Define post codes

For the most part, this doesn't change any post codes, simply making the
existing post-codes into macros.

picasso/romstage.c did get a couple of post codes removed to match the
other files.

The POST_ROMSTAGE and POST_BOOTBLOCK codes are intended to become global
at some point, while the POST_AGESA and POST_PSP codes would stay AMD
specific.

Change-Id: I007a09b6a3ed3280bac674cd74e298ec5c408ab7
Signed-off-by: Martin Roth <gaumless@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/69867
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
diff --git a/src/soc/amd/common/block/cpu/car/cache_as_ram.S b/src/soc/amd/common/block/cpu/car/cache_as_ram.S
index 251e23a..b38ce80 100644
--- a/src/soc/amd/common/block/cpu/car/cache_as_ram.S
+++ b/src/soc/amd/common/block/cpu/car/cache_as_ram.S
@@ -8,6 +8,7 @@
  ******************************************************************************
  */
 
+#include <amdblocks/post_codes.h>
 #include <cpu/x86/post_code.h>
 
 .section .init
@@ -27,7 +28,7 @@
 .global bootblock_pre_c_entry
 bootblock_pre_c_entry:
 
-	post_code(0xa0)
+	post_code(POST_BOOTBLOCK_PRE_C_ENTRY)
 
 	AMD_ENABLE_STACK
 
@@ -41,7 +42,7 @@
 	pushl	%eax		/* tsc[31:0] */
 
 before_carstage:
-	post_code(0xa2)
+	post_code(POST_BOOTBLOCK_PRE_C_DONE)
 
 	call	bootblock_c_entry
 	/* Never reached */