ASoC: audio: update API name for populate upper 32bits

In audio ion driver, append msm_audio_ to API
populate_upper_32bits to maintain consistency
across other API names in this driver.

Change-Id: I72aace56bf8e80c6dd83f768876253d2c7f334bb
Signed-off-by: Laxminath Kasam <lkasam@codeaurora.org>