MIPS: ralink: make early_printk work on RT2880

RT2880 has a different location for the early serial port.
Signed-off-by: John Crispin <blogic@openwrt.org>
Acked-by: Gabor Juhos <juhosg@openwrt.org>
Patchwork: http://patchwork.linux-mips.org/patch/5170/

arch/mips/ralink/early_printk.c

@@ -11,7 +11,11 @@
 
 #include <asm/addrspace.h>
 
+#ifdef CONFIG_SOC_RT288X
+#define EARLY_UART_BASE         0x300c00
+#else
 #define EARLY_UART_BASE         0x10000c00
+#endif
 
 #define UART_REG_RX             0x00
 #define UART_REG_TX             0x04