msm: ecm_ipa: add support for ecm_ipa over HSIC

Adds support for ecm_ipa call over HSIC. Required changes in IPA driver
as well.

Change-Id: I2e13476cbd57fcb0cb93314ea493738f4088f6f7
Signed-off-by: Gidon Studinski <gidons@codeaurora.org>
Signed-off-by: Ravit Katzav <rkatzav@codeaurora.org>
[mattw@codeaurora.org: Drop changes to ipa_utils.c and ipa.h, which are
already present on this branch]
Signed-off-by: Matt Wagantall <mattw@codeaurora.org>