mb/google/rex: split TOUCHSCREEN_I2C_SPI definition
As TOUCHSCREEN_I2C_SPI will be used for two different configurations,
splitting it to TOUCHSCREEN_GSPI and TOUCHSCREEN_THC, and re-order
the FW_CONFIG bits by moving VPU to different bit position.
BUG=b:
307774932
TEST=build and boot rex
Signed-off-by: YH Lin <yueherngl@google.com>
Change-Id: Ied4d732ef7993e95edbb7eb281842b9392e72820
Reviewed-on: https://review.coreboot.org/c/coreboot/+/78939
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Subrata Banik <subratabanik@google.com>