ASoC: Change Ear PA disable sequence

Current code disables Ear PA clock before Ear PA is
disabled completely. This produces a tick noise when
a voice call is disconnected. The changes disables the
Ear PA clock after the Ear PA is disabled completely.

CRs-Fixed: 629477
Change-Id: Id8f0f36dbe56b752da40f4b7f571a905f6292241
Signed-off-by: Aravind Kumar <akumark@codeaurora.org>