bcm53xx: fix hangs in PCIe2 host driver

Accessing CFG regs with no card present results in SoC hang.

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


git-svn-id: svn://svn.openwrt.org/openwrt/trunk@42895 3c298f89-4303-0410-b956-a3cf2f4a3e73