serial: uartlite: Fix compilation warnings

Do not setup userial_ports array as const because
in uartlite_serial_putc is out_be32 which can't write
to tx_fifo if is const.

Warning log:
serial_xuartlite.c: In function 'uartlite_serial_putc':
serial_xuartlite.c:60: warning: initialization discards qualifiers from pointer target type
serial_xuartlite.c: In function 'uartlite_serial_getc':
serial_xuartlite.c:78: warning: initialization discards qualifiers from pointer target type
serial_xuartlite.c: In function 'uartlite_serial_tstc':
serial_xuartlite.c:87: warning: initialization discards qualifiers from pointer target type

Signed-off-by: Michal Simek <monstr@monstr.eu>

drivers/serial/serial_xuartlite.c

@@ -40,7 +40,7 @@ struct uartlite {
 	unsigned int status;
 };
 
-static const struct uartlite *userial_ports[4] = {
+static struct uartlite *userial_ports[4] = {
 #ifdef XILINX_UARTLITE_BASEADDR
 	[0] = (struct uartlite *)XILINX_UARTLITE_BASEADDR,
 #endif