Revert "msm: wcnss: Add the support to access IRIS registers using bit-bang"

Remove IRIS dump support such that dependency on
platform based pinctrl and GPIO support can be avoided.
This reverts commit 638cce88.

Change-Id: I9794bb05f19865db47abfbb575385d745bd5cb47
CRs-Fixed: 663727
Signed-off-by: Pradeep Kumar Goudagunta <gpradeep@codeaurora.org>