arm: mx6: Add UART8 base address for i.MX6UL

Add the base address for the i.MX6UL so that this UART can be used.
Signed-off-by: NStefan Roese <sr@denx.de>
Cc: Ye Li <ye.li@nxp.com>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Cc: Stefano Babic <sbabic@denx.de>

arch/arm/include/asm/arch-mx6/imx-regs.h

@@ -162,6 +162,7 @@
 #endif
 #define UART1_BASE                  (ATZ1_BASE_ADDR + 0x20000)
 #define ESAI1_BASE_ADDR             (ATZ1_BASE_ADDR + 0x24000)
+#define UART8_BASE                  (ATZ1_BASE_ADDR + 0x24000)
 #define SSI1_BASE_ADDR              (ATZ1_BASE_ADDR + 0x28000)
 #define SSI2_BASE_ADDR              (ATZ1_BASE_ADDR + 0x2C000)
 #define SSI3_BASE_ADDR              (ATZ1_BASE_ADDR + 0x30000)