msm: ipa: fix compilation issues with ipa header

Fixed compilation issues which occur when CONFIG_IPA is not
enabled in the defconfig.

Change-Id: I4f90ceaf4e0b28d1d331cd1f0413b5c01525d825
Acked-by: David Arinzon <darinzon@qti.qualcomm.com>
Signed-off-by: Sivan Reinstein <sivanr@codeaurora.org>