Change the type on /dev/uinput to match /dev/uhid.

/dev/uinput is accessed in the same way as /dev/uhid,
and unlike /dev/input/*.  bluetooth requires access to
the former and not to the latter, while shell requires access
to the latter and not the former.  This is also consistent
with their DAC group ownerships (net_bt_stack for /dev/uinput
and /dev/uhid vs input for /dev/input/*).

Change-Id: I0059d832a7fe036ed888c91e1fb96f3e6e0bd2d4
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>