Platform: Disable UART0 on Musca-A and Musca-B1

This patch disables the UART0 on Musca-A and Musca-B1 because
no one is using it.

Change-Id: I3de587badc20f05b41654a552ca59e4bb36a62d1
Signed-off-by: Kevin Peng <kevin.peng@arm.com>
2 files changed