Bugzilla #3217: Create a new __drm_pci_free which is used internally in

    linux-core to free pci memory without freeing the structure. Linux-core
    internals often create pci dma handle structures on the stack due to
    the lack of a drm_local_map_t to store them in properly. Fix the
    original drm_pci_free to actually free the dma handle structure instead
    of leaking it.
Signed-off-by: Sergey Vlasov <vsu@altlinux.ru>