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>

SVN-Revision: 38793