msm: ipa: Fix warning messages

Kernel throws a warning when space is used in memory cache name.
Make changes to use _ instead of space when creating
memory cache. Also make change to handle -ENODEV from IPCRTR
during SSR.

Change-Id: Ia34a5fb16bb4a5e95cc042b7fd5b152119520787
Acked-by: Chaitanya Pratapa <cpratapa@qti.qualcomm.com>
Signed-off-by: Ravinder Konka <rkonka@codeaurora.org>