memshare: Add HLOS S2 mapping while ramdump collection

The patch adds HLOS S2 mapping to memshare clients before
collecting ramdumps authorizing APPS to access memshare
regions.

Change-Id: I655a5238014f12b8df647852cd7762c724b13d84
Signed-off-by: Manoj Prabhu B <bmanoj@codeaurora.org>