ASoC: wcd9335: Fix kctl_put and get functionality for SLIM RXX MUX

Incorrect values are received when queried for SLIM RXX MUX.
This is due to incorrect logic in the put and get functions of this
kctl. Correct the logic to fix this issue.

CRs-Fixed: 1044539
Change-Id: Ic44cde84108efb09b96a84db03b27bd985131211
Signed-off-by: Venkata Narendra Kumar Gutta <vgutta@codeaurora.org>