irqchip/stm32mp-exti: CONFIG_STM32MP_EXTI should not default to y when compile-testing

irqchip/stm32mp-exti: CONFIG_STM32MP_EXTI should not default to y when compile-testing

[ Upstream commit 9151299ee5101e03eeed544c1280b0e14b89a8a4 ]

Merely enabling compile-testing should not enable additional functionality.

Fixes: 0be58e0553812fcb ("irqchip/stm32mp-exti: Allow building as module")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/ef5ec063b23522058f92087e072419ea233acfe9.1733243115.git.geert+renesas@glider.be
Signed-off-by: Sasha Levin <sashal@kernel.org>