qcacmn: Provide Rx LDPC support for 2G STA

Currently Rx LDPC is disabled for STA(2G) connection due to
PHY-B hardware limitation. PHY-A can still support RxLDPC, so
make changes such a way that when ever STA is on 2G band and
current hardware mode is non-dbs then enable the Rx LDPC and if
STA is on 2G band and current hardware mode is dbs then disable the
RX LDPC.

Change-Id: Ib0183fea06619056c61e297d3fcfd82d91775dcd
CRs-Fixed: 2046542
4 files changed