mb/google/rex/var/karis: Skip tcc_offset override

This change eliminates the unnecessary override of the tcc_offset
chip configuration to 10, as the default rex baseboard now handles
this setting correctly.

TEST=Successfully built and booted google/karis, confirming tcc_offset
remains at 10.

Change-Id: Ie40db1431fb0197ee360ad5656878e57f51c855b
Signed-off-by: Subrata Banik <subratabanik@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/80160
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tyler Wang <tyler.wang@quanta.corp-partner.google.com>
Reviewed-by: Kapil Porwal <kapilporwal@google.com>

src/mainboard/google/rex/variants/karis/overridetree.cb

@@ -77,8 +77,6 @@ chip soc/intel/meteorlake
 		[PchSerialIoIndexI2C5] = PchSerialIoPci,
 	}"
 
-	register "tcc_offset" = "10"
-
 	# Intel Common SoC Config
 	#+-------------------+---------------------------+
 	#| Field             |  Value                    |