Revert "camera: add iso parameter"

This reverts commit 5e677bf700ddae0e6b2044aa7ad7083d9b86db93.

Conflicts:

	include/camera/CameraParameters.h

	modified:   camera/Android.mk
	modified:   camera/CameraParameters.cpp
	modified:   include/camera/CameraParameters.h

Change-Id: Ibaa78f9e14d1d3e8e7a9b662e5f957be03d7a5ea