asoc: wcd934x: optimize ANC enablement logic for Tavil codec

In Tavil driver, both ANC0 and ANC1 channel registers are written when
each ANC channel is enabled. This logic results in high latency during
ANC enablement on Tavil codec. Optimize this logic by only writing the
corresponding channel registers when enabling ANC0 or ANC1.

Change-Id: I62e8572967e6ca6c851cbaaad5f1b8c19e5b1a5f
Signed-off-by: Xiaoyu Ye <benyxy@codeaurora.org>