TF700t: Function Keys (Fn) (2/2)

Enable the use of function keys on user-define key combination (CTRL, SHIFT, ALT)

Patchset 2: Remove debugging traces
            Update commit message
Patchset 3: Renamed title
            Updated scancodes and keylayout to fit asusdec
            Enabled function keys
            Rebased
Patchset 4: Rebased
Patchset 5: Fix spanish strings
Patchset 6: Fix aapt error

Requires http://review.cyanogenmod.org/#/c/35063
         http://review.cyanogenmod.org/#/c/35189

Change-Id: I250f51d779aa81c1caa4b85e285ce9069acd942e
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>