misc: pci_endpoint_test: Do not use managed IRQ functions

misc: pci_endpoint_test: Do not use managed IRQ functions

The pci_endpoint_test_request_irq() and pci_endpoint_test_release_irq()
are called repeatedly by the users through pci_endpoint_test_set_irq().
So using the managed version of IRQ functions within these functions
has no effect.

Suggested-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20250225110252.28866-7-hayashi.kunihiko@socionext.com
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>