msm: ipa: rm: fix memory allocation flags

IPA RM uses an atomic context for most of its API.
Fix memory allocation flags to atomic.

Change-Id: I8dfae7db843189901ca4467acf7cc3b8b3dc50fe
Acked-by: Ady Abraham <adya@qti.qualcomm.com>
Signed-off-by: Gidon Studinski <gidons@codeaurora.org>