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/mainboard/google/peach_pit/romstage.c b/src/mainboard/google/peach_pit/romstage.c
index 83d38fa..3509a45 100644
--- a/src/mainboard/google/peach_pit/romstage.c
+++ b/src/mainboard/google/peach_pit/romstage.c
@@ -212,7 +212,7 @@
 	power_init_failed = setup_power(is_resume);
 
 	timestamp_init(timestamp_get());
-	timestamp_add_now(TS_START_ROMSTAGE);
+	timestamp_add_now(TS_ROMSTAGE_START);
 
 	/* Clock must be initialized before console_init, otherwise you may need
 	 * to re-initialize serial console drivers again. */
@@ -228,11 +228,11 @@
 	/* re-initialize PMIC I2C channel after (re-)setting system clocks */
 	i2c_init(PMIC_I2C_BUS, 1000000, 0x00); /* 1MHz */
 
-	timestamp_add_now(TS_BEFORE_INITRAM);
+	timestamp_add_now(TS_INITRAM_START);
 
 	setup_memory(&mem_timings, is_resume);
 
-	timestamp_add_now(TS_AFTER_INITRAM);
+	timestamp_add_now(TS_INITRAM_END);
 
 	primitive_mem_test();