ASoC: wcd: avoid long button press with headphone insertion

When headphone is inserted in the target and it detects it
as headset initially, there can be long button press reported
when the FSM is toggled. Make sure to cancel long button
press appropriately to avoid this.

CRs-Fixed: 801630
Change-Id: I7b69793bbb182ffea9fe675ae05267240329c214
Signed-off-by: Simmi Pateriya <simmip@codeaurora.org>