gfx: pvr: fix SGX_READ_HWPERF IOCTL according to v1.7 ABI

gfx: pvr: fix SGX_READ_HWPERF IOCTL according to v1.7 ABI

There has been a change in the parameters for this IOCTL in v1.7 of the
driver. While the userspace library was updated accordingly we didn't do
this on the kernel side. We missed the difference since the size of the
structure wasn't checked against the user space version. The next patch
will add this check to avoid similar problems in the future.

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