net: wireless: bcmdhd: reorder sdlock to avoid lockup

net: wireless: bcmdhd: reorder sdlock to avoid lockup

dhd_os_sdlock() is called in dhd_watchdog(), which is the timer function
of dhd->timer. So we need to release the lock before deleting the timer
to avoid cpu lockup.

bug 1526837

Change-Id: Icbeb393afe81ff476d0e133f60bc7b0477d37364
Signed-off-by: Allen Yu <alleny@nvidia.com>
Reviewed-on: http://git-master/r/435684
Reviewed-by: Sang-Hun Lee <sanlee@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Mohan Thadikamalla <mohant@nvidia.com>
Reviewed-by: Mitch Luban <mluban@nvidia.com>