pil: Fix minidump collection during SSR

By default, the ramdump driver expects the virtual address of the
segments to be set in order to collect the dumps. However, the
minidump collection path in the PIL driver doesn't honor this
requirement. Hence, generate a mapping on the physical address
and use that to collect the minidumps.

Change-Id: Icb7b20dc5f31daab6d1f1be5b7046e4c18dea31a
Signed-off-by: Raghavendra Rao Ananta <rananta@codeaurora.org>