ASoC: wcd9304: Change default bias current for lineout PA.

The bias current on the lineout PA was originally defaulted to 10 uA.
 It is observed from measurements that setting the lineout PA bias
current to 7uA results into lesser power comsumption.

CRs-fixed: 382838
Change-Id: I5f94cc915b193bf52ee351b201868197bca97123
Signed-off-by: Simmi Pateriya <simmip@codeaurora.org>