ARM: cns3xxx: drop unnecessary symbol selection

ARCH_CNS3XXX already selects MIGHT_HAVE_PCI, so boards don't have to
Signed-off-by: NImre Kaloz <kaloz@openwrt.org>
Signed-off-by: NArnd Bergmann <arnd@arndb.de>

arch/arm/mach-cns3xxx/Kconfig

@@ -3,7 +3,6 @@ menu "CNS3XXX platform type"
 
 config MACH_CNS3420VB
 	bool "Support for CNS3420 Validation Board"
-	select MIGHT_HAVE_PCI
 	help
 	  Include support for the Cavium Networks CNS3420 MPCore Platform
 	  Baseboard.