gpu: pvr: pdump: assume that SGX_MMU_PAGE_SIZE equals PAGE_SIZE

gpu: pvr: pdump: assume that SGX_MMU_PAGE_SIZE equals PAGE_SIZE

This way, the address mangling code becomes a lot clearer.

The following changes are made:
SGX_MMU_PAGE_SIZE -> PAGE_SIZE.
SGX_MMU_PDE_ADDR_MASK -> PAGE_MASK
~(PAGE_SIZE - 1) -> PAGE_MASK
(Address >> SGX_MMU_PAGE_SHIFT) * PAGE_SIZE -> Address & PAGE_MASK

A few functions which get SGX_MMU_PAGE_SIZE passed lose this
argument and use PAGE_SIZE internally.

No functional changes on machines where PAGE_SIZE is the same for
the host as for the sgx.

Signed-off-by: Luc Verhaegen <Luc.Verhaegen@basyskom.de>
Signed-off-by: Imre Deak <imre.deak@nokia.com>