ASoc: msm: Add fix for Unsupported Proxy backend sample rates.

- AFE does not support sampling rate 44.1k
- This fix addresses the issue by setting backend proxy device
  sampling rate to 48k.

Change-Id: I4cd1ac6566d3230fa16fd70d99b8e758d8c606ad
CRs-fixed: 374556
Signed-off-by: Jayasena Sangaraboina <jsanga@codeaurora.org>