UARTs on CNS3xxx are 8250-compatible, not AMBA.
The base address for UART0 is 0x78000000 (physical)
and 0xfb002000 (virtual).

Signed-off-by: Krzysztof Hałasa <khalasa@piap.pl>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>