msm: camera: Remove subsystem_map header

The old subsystem_map APIs are being deprecated. The
msm_subsystem_map.h header file used to have definitions for
iommu domains. Remove this header file and include iommu_domains.h
to get the necessary iommu definitions.

Change-Id: I417a357789a8fea16bbadd98663a8ebe873ff4e7
Signed-off-by: Laura Abbott <lauraa@codeaurora.org>