cnss: Remove ioremap code for SSR

SSR framework/application can direcly handle the physical address of
reserved debug memory for CNSS, so it doesn't need to provide them
the address after ioremap.

Change-Id: I9355dbb7d6638481ea8accbaf3bb71f94344ffd2
CRs-fixed: 585079
Signed-off-by: Yue Ma <yuem@codeaurora.org>