irqchip: Build IMX_MU_MSI only on ARM

Compile-testing IMX_MU_MSI on x86 without PCI_MSI support results in a
build failure:

drivers/gpio/gpio-sprd.c:8:
include/linux/gpio/driver.h:41:33: error: field 'msiinfo' has incomplete type
drivers/iommu/iommufd/viommu.c:4:
include/linux/msi.h:528:33: error: field 'alloc_info' has incomplete type

Tighten the dependency further to only allow compile testing on Arm.
This could be refined further to allow certain x86 configs.

This was submitted before to address a different build failure, which was
fixed differently, but the problem has now returned in a different form.

Fixes: 70afdab ("irqchip: Add IMX MU MSI controller driver")
Signed-off-by: Arnd Bergmann <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Link: https://lore.kernel.org/all/[email protected]
Link: https://lore.kernel.org/all/[email protected]/

Author: arndb

drivers/irqchip/Kconfig

@@ -554,6 +554,7 @@ config IMX_MU_MSI
 	tristate "i.MX MU used as MSI controller"
 	depends on OF && HAS_IOMEM
 	depends on ARCH_MXC || COMPILE_TEST
+	depends on ARM || ARM64
 	default m if ARCH_MXC
 	select IRQ_DOMAIN
 	select IRQ_DOMAIN_HIERARCHY