davinci: cleanup: move dm355 UART2 define to dm355.c

Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>

arch/arm/mach-davinci/include/mach/serial.h

@@ -18,8 +18,6 @@
 #define DAVINCI_UART1_BASE	(IO_PHYS + 0x20400)
 #define DAVINCI_UART2_BASE	(IO_PHYS + 0x20800)
 
-#define DM355_UART2_BASE        (IO_PHYS + 0x206000)
-
 /* DaVinci UART register offsets */
 #define UART_DAVINCI_PWREMU		0x0c
 #define UART_DM646X_SCR			0x10