timestamps: Rename timestamps to make names more consistent

This patch aims to make timestamps more consistent in naming,
to follow one pattern. Until now there were many naming patterns:
- TS_START_*/TS_END_*
- TS_BEFORE_*/TS_AFTER_*
- TS_*_START/TS_*_END
This change also aims to indicate, that these timestamps can be used
to create time-ranges, e.g. from TS_BOOTBLOCK_START to TS_BOOTBLOCK_END.

Signed-off-by: Jakub Czapiga <jacz@semihalf.com>
Change-Id: I533e32392224d9b67c37e6a67987b09bf1cf51c6
Reviewed-on: https://review.coreboot.org/c/coreboot/+/62019
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Reviewed-by: Raul Rangel <rrangel@chromium.org>
diff --git a/src/drivers/amd/agesa/romstage.c b/src/drivers/amd/agesa/romstage.c
index 871054b..5968f73 100644
--- a/src/drivers/amd/agesa/romstage.c
+++ b/src/drivers/amd/agesa/romstage.c
@@ -40,7 +40,7 @@
 
 	fill_sysinfo(cb);
 
-	timestamp_add_now(TS_START_ROMSTAGE);
+	timestamp_add_now(TS_ROMSTAGE_START);
 
 	board_BeforeAgesa(cb);
 
@@ -55,14 +55,14 @@
 
 	agesa_execute_state(cb, AMD_INIT_EARLY);
 
-	timestamp_add_now(TS_BEFORE_INITRAM);
+	timestamp_add_now(TS_INITRAM_START);
 
 	if (!cb->s3resume)
 		agesa_execute_state(cb, AMD_INIT_POST);
 	else
 		agesa_execute_state(cb, AMD_INIT_RESUME);
 
-	timestamp_add_now(TS_AFTER_INITRAM);
+	timestamp_add_now(TS_INITRAM_END);
 
 	/* Work around AGESA setting all memory as WB on normal
 	 * boot path.