ASoc: wcd9310: sleep 10 milli sec after HPH PA turn off

There is a pop after HPH PA turn off. wcd9310 specification specifies
40 millie sec sleep after HPH PA turn off, to have pop with in
100 micro volts. On-target testing shows that 10 milli second sleep is
good enough.

Signed-off-by: Kiran Kandi <kkandi@codeaurora.org>
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