msm: camera: uapi: Add flags for additional IFE HW

As part of acquire HW, kernel passes the IFE hw_idx to
userspace. This change will enable the capability to pass
the hw_idx of additional IFE HW enabled.

CRs-Fixed: 2582959
Change-Id: I689b99d021c8d0f3440e46d09a5dcda3daaefcfc
Signed-off-by: Vishalsingh Hajeri <vhajeri@codeaurora.org>