uboot-imx

ml507: Fix Xilinx uartlite driver hang

The default configuration for ml507 will generate a hang() in the
Xilinx uartlite driver.

userial_ports[] in drivers/serial/serial_xuartlite.c does not get
initialized properly. CONFIG_SERIAL_BASE is unused.
XILINX_UARTLITE_BASEADDR is used instead.

Signed-off-by: Rommel Custodio <sessyargc+uboot@gmail.com>