ASoC: msm: Fix repeated reg phy stream issue

Fix repeated reg phy stream issue in loopback driver
which cause audio dsp calibration failure due to
rtac device could not remove successfully.

Change-Id: Ifa1b9cd579bc313d4addc00d48a8b4b636181220
Signed-off-by: Cong Tang <congt@codeaurora.org>