Adding GPIO request/free support for Intel Edison LED driver

This commit adds in support for request/free GPIO operations
in the LED driver so that the GPIO pin can be freed for use
by 3rd party libraries (like MRAA) that wish to control
the GPIO pins directly for the LED.

Also adding support for debug kernel configuration option
(to print helpful debugging messages).

Change-Id: If20f78721239fdfe605aeeb2095d123a4cc69807
Signed-off-by: Brian Wood <brian.j.wood@intel.com>
3 files changed