msm: ipa: Add snapshot of ECM IPA header

This adds just the header file associated with the ECM IPA
driver in order to allow the USB BAM gadget driver to compile.

This snapshot is taken as of msm-3.14 commit 3bc54cf86b (Merge
"msm: camera: Add dummy sub module in sensor pipeline")

Signed-off-by: Jack Pham <jackp@codeaurora.org>