Put the device id-to-gpio mapping in a table to make it easier to add
new devices.  The list of supported devices is unchanged.
Signed-off-by: NBob Copeland <me@bobcopeland.com>
Acked-by: NJiri Slaby <jirislaby@gmail.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

Move LED code out of base.c for clarity.

Changes-licensed-under: 3-Clause-BSD
Signed-off-by: NBob Copeland <me@bobcopeland.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>