mesa: Fix function pointers initialization in status tracker

We assigned the function that gets the device uuid to the GetDriverUuid
function pointer and the function that gets the driver uuid to the
GetDeviceUuid function pointer inside the state tracker. Exchanged the
pointers.

cc: mesa-stable@lists.freedesktop.org
Reviewed-by: Brian Paul <brianp@vmware.com>
(cherry picked from commit 8096b558)
[Emil Velikov: trivial conflicts]
Signed-off-by: Emil Velikov <emil.velikov@collaboral.com>
Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>

Conflicts:
	src/mesa/state_tracker/st_context.c