kernel: b53: fix untagged shift for BCM5365

The BCM5365 needs a shift of 7 bits and not 6 bits like the BCM5325 for 
the untagged ports.

Thank you Russell for reporting this and testing the patch.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>


git-svn-id: svn://svn.openwrt.org/openwrt/trunk@38793 3c298f89-4303-0410-b956-a3cf2f4a3e73