ARM: shmobile: Add select MIGHT_HAVE_PCI for PCI-AHB bridge code
The PCI sub-system is not enabled by default on ARM and on certain Renesas devices the build does not select it. This means that there are configurations that do not allow the AHB-PCI bridge used for the USB sub-systems to be built. For the R8A7790, R8A7791 and EMEV-2 select MIGHT_HAVE_PCI to allow the PCI drivers to be built. Also select MIGHT_HAVE_PCI for the multi-config where there may be many Reneasas devices selected. Reviewed-by: NIan Molton <ian.molton@codethink.co.uk> Signed-off-by: NBen Dooks <ben.dooks@codethink.co.uk> Signed-off-by: NSimon Horman <horms+renesas@verge.net.au>
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