iwlwifi: mvm: move rt status check to the start of the resume flow

Move the rt status checking to the start of the resume flow in order
to avoid sending D0I3_END_CMD to the FW.  Also, collect dump if an
assert was encountered.

Signed-off-by: Shahar S Matityahu <shahar.s.matityahu@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>