ASoC: wcd-mbhc: Fix list del entry issue on mbhc variable

Without re-init timeout completion of btn_press object
waiting in correct_plug_swch work, if mbhc_deinit and mbhc_start
happens again, it results in crash. In mbhc_deinit,
cancel correct_plug_swch work to handle this.

CRs-Fixed: 2018976
Change-Id: Ic26edea18f5a8554f4dff3bf6ad49ec039493a64
Signed-off-by: Laxminath Kasam <lkasam@codeaurora.org>