add elf format introduction file

Signed-off-by: daoweifan <daowei.fan@delphi.com>
gsm, remove compile bug.

Signed-off-by: daoweifan <daowei.fan@delphi.com>
sim900a, improve it.

Signed-off-by: daoweifan <daowei.fan@delphi.com>
device, add graphic device type.

Signed-off-by: daoweifan <daowei.fan@delphi.com>
r61580, add r61580 controller driver.

Signed-off-by: daoweifan <daowei.fan@delphi.com>
r61580, improve it. work well with command.

Signed-off-by: daoweifan <daowei.fan@delphi.com>
r61580, implement the interface in device.h.

Signed-off-by: daoweifan <daowei.fan@delphi.com>
lcd, seperate lcd cmd from r61580 and simplify device.h

Signed-off-by: daoweifan <daowei.fan@delphi.com>