media: rc: keymaps: add missing MODULE_DESCRIPTION to keymaps

When building the modules 'modpost' warns about missing MODULE_DESCRIPTION.

Since almost none of the rc keymap modules have this, it produces a lot of
warnings.

As a first step to fixing all media modules, add this line to all keymaps.
The description should be a human-readable string describing the remote
or the remote controller that the keymap can be used with.

Note that keymaps/rc-cec.c is actually compiled into the rc-core, so that
is the sole keymap source that didn't need this.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Sean Young <sean@mess.org>

media: rc: imon-rsc keymap has incorrect mappings

KEY_MAX is not a key but designates the highest value a linux keycode
can ever have.

Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

media: rc: nec keymaps should specify the nec variant they use

The rc_proto field should list the exact variant used by the remote. This
does not change the decoder used, but helps with using keymaps for
transmit purposes.

Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

media: rc: add keymap for iMON RSC remote

Note that the stick on the remote is not supported yet.

Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>