post: Migrate to Kconfig

We move the existing CONFIG_POST_* functionality over to CFG_POST and
then introduce CONFIG_POST to Kconfig.

Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/include/configs/P2041RDB.h b/include/configs/P2041RDB.h
index acbd434..8b901ca 100644
--- a/include/configs/P2041RDB.h
+++ b/include/configs/P2041RDB.h
@@ -41,7 +41,7 @@
  */
 #define CFG_SYS_INIT_L2CSR0		L2CSR0_L2E
 
-#define CONFIG_POST CFG_SYS_POST_MEMORY	/* test POST memory test */
+#define CFG_POST CFG_SYS_POST_MEMORY	/* test POST memory test */
 
 /*
  *  Config the L3 Cache as L3 SRAM