commonlib: Add timestamp strings for TS_FSP_MULTI_PHASE_SI_INIT_x

TEST=Refer to `cbmem -t` output below:
Without this code changes, timestamp ids 962 and 963 are listed as
`unknown`.

 962:<unknown>                                         1,704,863 (157)
 963:<unknown>                                         1,704,878 (14)

With this code changes, lists the timestamps along with the timestamp
strings.

 962:calling FspMultiPhaseSiInit                       1,704,863 (157)
 963:returning from FspMultiPhaseSiInit                1,704,878 (14)

Change-Id: I528567e4cc630e15dffffd1c7684798fcdde4535
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56641
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

0 files changed, 0 insertions, 0 deletions