Platform/Sgi: Update ACPI tables to use console UART

Patch 433b5b1b ("Platform/Sgi: Route logs to different sets of
consoles") assigns different address for the console UART and the debug
UART. Correspondingly, update the SPCR and SSDT ACPI tables to use the
address of the console UART port instead of the debug UART port.

Signed-off-by: Rohit Mathew <rohit.mathew@arm.com>
Reviewed-by: Thomas Abraham <thomas.abraham@arm.com>
Reviewed-by: Sami Mujawar <sami.mujawar@arm.com>
Tested-by: Thomas Abraham <thomas.abraham@arm.com>