soc: swr-mstr: set slave host configuration during enumeration

Slave attached interrupt is observed to be delayed from hardware
sometimes even though enumeration is complete. Hence, do the new
slave configuration, host irq programming, upon enumeration
completion instead of waiting for interrrupt.

Change-Id: I0033b9c9452b03b650201c4c6a9d937c6b0772f2
Signed-off-by: Ramprasad Katkam <katkam@codeaurora.org>