asoc: codecs: wcd938x: remove delays in headphone power down

Delays in headphone power down path can be removed
and without any click and pop issues. This way it
reduces headphone power down time.

Change-Id: Iedfbbee7d2be27cc5dfc62c9def72e7be81d7eaf
Signed-off-by: Karthikeyan Mani <kmani@codeaurora.org>