eCos EDOSK-2674 HAL Data Structures

Here are the data structures with brief descriptions:

channel_data_t	Structure for storing configuration data of a single serial channel
HAL_SavedRegisters	Processor saved state
HAL_STUB_INSTR_BACKUP	Stores breakpoint data
HAL_STUB_LSC_BUF	For long, short and byte access
int_ackn_t	This type stores mask and address of interrupt acknowledge register
int_mask_t	This data type stores mask and address of one interrupt source
int_prio_conf_t	Interrupt configuration data structure

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