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

This reverts commit 36454361, since the tmpfs is clobbering mountpoints created by init.hardware.rc. Most (all?) devices with non-emulated SDs are currently b0rked.

Change-Id: Ib34660e2d45473775757e94800fc4ec57f6c8d77