Enable GICv2m on ARM virt machine

qemu implementation of "virt" includes GICv2m. This commit allows to use it also on ARM32 architecture.

msi.h is added because it is required by linux/msi.h
if CONFIG_GENERIC_MSI_IRQ_DOMAIN is defined. It gets enabled by the following KConfig dependency chain:
ARM_GIC_V2M => PCI_MSI_IRQ_DOMAIN => GENERIC_MSI_IRQ_DOMAIN

---
v1 => v2:
Added verbose explanation in commit message

---
 arch/arm/Kconfig            | 1 +
 arch/arm/include/asm/Kbuild | 1 +
 2 files changed, 2 insertions(+)

index 45df48b..1091025 100644
@@ -815,6 +815,7 @@ config ARCH_VIRT
 	bool "Dummy Virtual Machine" if ARCH_MULTI_V7
 	select ARM_AMBA
 	select ARM_GIC
+	select ARM_GIC_V2M if PCI_MSI
 	select ARM_PSCI
 	select HAVE_ARM_ARCH_TIMER
 

index 3c4596d..01806f5 100644
@@ -14,6 +14,7 @@ generic-y += local.h
 generic-y += local64.h
 generic-y += mcs_spinlock.h
 generic-y += msgbuf.h
+generic-y += msi.h
 generic-y += param.h
 generic-y += parport.h
 generic-y += poll.h

1.9.5.msysgit.0



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