PCI: endpoint: pcitest: Add IRQ_TYPE_* defines to UAPI header

PCI: endpoint: pcitest: Add IRQ_TYPE_* defines to UAPI header

These IRQ_TYPE_* defines are used by both drivers/misc/pci_endpoint_test.c
and tools/testing/selftests/pci_endpoint/pci_endpoint_test.c.

Considering that both the misc driver and the selftest already includes
the pcitest.h UAPI header, it makes sense for these IRQ_TYPE_* defines
to be located in the pcitest.h UAPI header.

Signed-off-by: Niklas Cassel <cassel@kernel.org>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Link: https://lore.kernel.org/r/20250310111016.859445-10-cassel@kernel.org