msm: copper: Update PHYS_OFFSET and image load address

RUMI address offsets are in 0x20200000 range, update the
PHYS_OFFSET and zreladdr to match this. This would also
change the offsets for the simulation to match that of
RUMI platform so as to allow the same image to be used on
both platforms.

Change-Id: Id422a537e02299571e185b3f0d24930e56fa2b59
Signed-off-by: Sathish Ambley <sambley@codeaurora.org>