soc/intel/cannonlake: Clean up UART code

Clean up and move UART related code under a single uart.c file.

Change-Id: I7eea910e065242689e87adac41281131674b39af
Signed-off-by: Aamir Bohra <aamir.bohra@intel.com>
Reviewed-on: https://review.coreboot.org/22771
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Subrata Banik <subrata.banik@intel.com>
3 files changed