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/northbridge/intel/x4x/raminit.c b/src/northbridge/intel/x4x/raminit.c
index 460916b..2f844a5 100644
--- a/src/northbridge/intel/x4x/raminit.c
+++ b/src/northbridge/intel/x4x/raminit.c
@@ -566,7 +566,7 @@
 	int fast_boot, cbmem_was_inited;
 	size_t mrc_size;
 
-	timestamp_add_now(TS_BEFORE_INITRAM);
+	timestamp_add_now(TS_INITRAM_START);
 	printk(BIOS_DEBUG, "Setting up RAM controller.\n");
 
 	pci_write_config8(HOST_BRIDGE, 0xdf, 0xff);
@@ -638,7 +638,7 @@
 
 	pci_or_config8(HOST_BRIDGE, 0xf4, 1);
 
-	timestamp_add_now(TS_AFTER_INITRAM);
+	timestamp_add_now(TS_INITRAM_END);
 
 	printk(BIOS_DEBUG, "RAM initialization finished.\n");