ASoC: msm: qdsp6v2: Fix out-of-bounds access in put functions

Add out of bounds check in routing put functions
for the mux value before accessing the texts
pointer of soc_enum struct with mux as index.

CRs-fixed: 1097569
Change-Id: If1161ea918680deacc0d322d11f42637f377a9ab
Signed-off-by: Karthikeyan Mani <kmani@codeaurora.org>