soc: swr-mstr: Reduce swr register write sleep timings

Reduce swr bulk write and swr command fifo write sleeps
to reach coldstart latency numbers.

Change-Id: I52f2868a488e167b0a0f617b6af3e79cbf6f7eea
Signed-off-by: Karthikeyan Mani <kmani@codeaurora.org>