powerpc: PCI_MSI needs PCI

Various powerpc boards select the PCI_MSI config option without selecting
PCI, resulting in potentially not compilable configurations if the by
default enabled PCI option is disabled.  Explicitly select PCI to ensure
we always have valid configs.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

arch/powerpc/platforms/40x/Kconfig

@@ -29,6 +29,7 @@ config KILAUEA
 	select 405EX
 	select PPC40x_SIMPLE
 	select PPC4xx_PCI_EXPRESS
+	select PCI
 	select PCI_MSI
 	select PPC4xx_MSI
 	help

arch/powerpc/platforms/44x/Kconfig

@@ -21,6 +21,7 @@ config BLUESTONE
 	depends on 44x
 	select PPC44x_SIMPLE
 	select APM821xx
+	select PCI
 	select PCI_MSI
 	select PPC4xx_MSI
 	select PPC4xx_PCI_EXPRESS
@@ -200,6 +201,7 @@ config AKEBONO
 	select SWIOTLB
 	select 476FPE
 	select PPC4xx_PCI_EXPRESS
+	select PCI
 	select PCI_MSI
 	select PPC4xx_HSTA_MSI
 	select I2C