Switch to use of value-indexed xlats for evdev constants

Switch to use of value-indexed xlats for evdev constants

* xlat/evdev_abs.in: Add "#value_indexed" directive.
* xlat/evdev_autorepeat.in: Likewise.
* xlat/evdev_ff_status.in: Likewise.
* xlat/evdev_keycode.in: Likewise.
* xlat/evdev_leds.in: Likewise.
* xlat/evdev_misc.in: Likewise.
* xlat/evdev_prop.in: Likewise.
* xlat/evdev_relative_axes.in: Likewise.
* xlat/evdev_snd.in: Likewise.
* xlat/evdev_switch.in: Likewise.
* xlat/evdev_sync.in: Likewise.
* xlat/evdev_ff_types.in: Add a comment about sorting.
* evdev.c (keycode_ioctl, keycode_V2_ioctl): Use printxval_index
instead of printxval.
(bit_ioctl): Use XT_SORTED for evdev_ff_types, use XT_INDEXED
for other xlats.
(evdev_read_ioctl): Use XT_INDEXED for all xlats.
* ioctl.c (evdev_decode_number): Use printxval_indexn instead of
printxval for evdev_abs.