gfx: pvr: remove warning on gaps in the IOCTL ID range

gfx: pvr: remove warning on gaps in the IOCTL ID range

There is no reason to warn for gaps only bigger than 5, while allowing
gaps less than 5. Also in the future we will have a gap as we want to
move the PDUMP IDs to the end of the range. Undefined IOCTLs will be
caught anyway by the IOCTL dispatcher, so remove this check.

Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Pauli Nieminen <pauli.nieminen@linux.intel.com>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>