RC: add summary for customize hardware keys option

*This is really just to point out that this requires a reboot.
 Should clear up any confusion for the time being.

Change-Id: I0fd77a16e51969e3d25c55cce1f657af831bdabb
Signed-off-by: Jonathan Steadman <xxwhitehawk@gmail.com>
Merge "RC: add summary for customize hardware keys option" into kitkat