wil6210: unmask RX_HTRSH interrupt only when connected

RX_HTRSH interrupt sometimes triggered during device reset
procedure.
To prevent handling this interrupt when not required, unmask
this interrupt only if we are connected and mask it when
disconnected.

Change-Id: I9fa0e28d91d0962fc7f05b2cf92c99c2431a2295
Signed-off-by: Maya Erez <qca_merez@qca.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
Git-commit: 54eaa8c69e72dca4c824cd390b616cb48b2c4e30
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/kvalo/ath.git


CRs-Fixed: 1015627
Signed-off-by: Maya Erez <merez@codeaurora.org>