kernel debug Low level

CONFIG_DEBUG_LL
CONFIG_DEBUG_KERNEL

arch/arm/plat-mxc/include/mach/debug-macro.S

add definition:
#define MXC_LL_UART_PADDR UART1_BASE_ADDR
#define MXC_LL_UART_VADDR AIPS1_IO_ADDRESS(UART1_BASE_ADDR)