power: qpnp-smbcharger: remove wireless insertion work

The stark based wireless charger need not delay drawing current from
DC path. The wireless insertion work was created just to provide the
delay after the pad was detected to be present.

Remove this code.
Change-Id: I952d395fe77c6e07012f491691598b3feac1303f
Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>