Revert "init.rc: Create /storage mountpoint so Dalvik can mark as slave in zygotes"

No longer needed as Dalvik no longer marks /storage as slave in zygotes.

This reverts commit 4a8f70d11b225fbf56aca6e494f4de35fc727dc7.

Change-Id: I0bfb86f2cc10ccdc10daa7419ac4d252c8dfbae8
(cherry picked from commit 49f7c30e54fec5e3533c11f97ecce89f6c66aa51)
mkbootimg: Add --dt parameter to specify DT image

New optional --dt parameter to specify a kernel device
tree image.

Change-Id: I7e2c48c25c04165642eedadc3dc16a082dd99eb0
(cherry picked from commit 103b589b8141236492ae33232f647d2a28245a8e)