ARM: debug: bcmbca: Replace ARCH_BCM_63XX with ARCH_BCMBCA

Prepare for the BCM63138 ARCH_BCM_63XX migration to ARCH_BCMBCA. Make
DEBUG_BCM63XX_UART depending on ARCH_BCMBCA.

Signed-off-by: William Zhang <william.zhang@broadcom.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>