MX: serial_mxc: cleanup removing nasty #ifdef

The serial driver for iMX SOCs is continuosly changed if a
new SOC or not yet used port is used. CONFIG_SYS_<SOC>_<UART Port>
defines were used only to find the base address for the selected UART.
Instead of that, move the base address to the board configuration
file and drop all #ifdef from driver.

Signed-off-by: Stefano Babic <sbabic@denx.de>
CC: Marek Vasut <marek.vasut@gmail.com>
CC: Wolfgang Denk <wd@denx.de>
CC: Fabio Estevam <fabio.estevam@freescale.com>
CC: Helmut Raiger <helmut.raiger@hale.at>
CC: John Rigby <jcrigby@gmail.com>
CC: Matthias Weisser <weisserm@arcor.de>
CC: Jason Liu <jason.hui@linaro.org>
Acked-by: Jason Liu <jason.hui@linaro.org>
diff --git a/arch/arm/include/asm/arch-mx27/imx-regs.h b/arch/arm/include/asm/arch-mx27/imx-regs.h
index 83ab216..ced5b2a 100644
--- a/arch/arm/include/asm/arch-mx27/imx-regs.h
+++ b/arch/arm/include/asm/arch-mx27/imx-regs.h
@@ -224,10 +224,10 @@
 #define IMX_TIM1_BASE		(0x03000 + IMX_IO_BASE)
 #define IMX_TIM2_BASE		(0x04000 + IMX_IO_BASE)
 #define IMX_TIM3_BASE		(0x05000 + IMX_IO_BASE)
-#define IMX_UART1_BASE		(0x0a000 + IMX_IO_BASE)
-#define IMX_UART2_BASE		(0x0b000 + IMX_IO_BASE)
-#define IMX_UART3_BASE		(0x0c000 + IMX_IO_BASE)
-#define IMX_UART4_BASE		(0x0d000 + IMX_IO_BASE)
+#define UART1_BASE		(0x0a000 + IMX_IO_BASE)
+#define UART2_BASE		(0x0b000 + IMX_IO_BASE)
+#define UART3_BASE		(0x0c000 + IMX_IO_BASE)
+#define UART4_BASE		(0x0d000 + IMX_IO_BASE)
 #define IMX_I2C1_BASE		(0x12000 + IMX_IO_BASE)
 #define IMX_GPIO_BASE		(0x15000 + IMX_IO_BASE)
 #define IMX_TIM4_BASE		(0x19000 + IMX_IO_BASE)