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
Bug: 33649808
References: CVE-2017-0586
Change-Id: Ib9ef8d398f0765754b0f79666963fac043b66077
Signed-off-by: Karthikeyan Mani <kmani@codeaurora.org>
Signed-off-by: Haynes Mathew George <hgeorge@codeaurora.org>