intel/fsp: Add and use new post codes for FSP phase indication

New post codes are 
POST_FSP_MEMORY_EXIT
POST_FSP_SILICON_EXIT

This patch will make it more consistent to debug FSP hang
and reset issues.

Bug=none
Branch=none
TEST=Build and Boot on eve

Change-Id: I93004a09c2a3a97ac9458a0f686ab42415af19fb
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/20541
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
diff --git a/src/drivers/intel/fsp2_0/memory_init.c b/src/drivers/intel/fsp2_0/memory_init.c
index 43888c1..b08ee1e 100644
--- a/src/drivers/intel/fsp2_0/memory_init.c
+++ b/src/drivers/intel/fsp2_0/memory_init.c
@@ -361,7 +361,7 @@
 	post_code(POST_FSP_MEMORY_INIT);
 	timestamp_add_now(TS_FSP_MEMORY_INIT_START);
 	status = fsp_raminit(&fspm_upd, fsp_get_hob_list_ptr());
-	post_code(POST_FSP_MEMORY_INIT);
+	post_code(POST_FSP_MEMORY_EXIT);
 	timestamp_add_now(TS_FSP_MEMORY_INIT_END);
 
 	fsp_debug_after_memory_init(status);