soc: swr-mstr: Add delay between fifo writes to avoid overflow/underflow

Overflow/Underflow errors are observed sometimes while doing fifo write.
Add delay between writes to resolve error.

Change-Id: Id460e17753001a0dd52acd01a181d91132c36048
Signed-off-by: Vatsal Bucha <vbucha@codeaurora.org>