Replace literal 0x7f with PCI_HEADER_TYPE_MASK.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20231124090919.23687-6-ilpo.jarvinen@linux.intel.com