This backports upstream commit 702131e2a393b45174be326f1dbe20b658b4f157
bcma: move PCI IRQ control function to host specific code

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@44969 3c298f89-4303-0410-b956-a3cf2f4a3e73