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The denver_enable_dco and denver_disable_dco use register X3 to store
the return address. But X3 gets over-written by other functions,
downstream.

This patch stores the return address to X18 instead, to fix this
anomaly.

Change-Id: Ic40bfc1d9abaa7b90348843b9ecd09521bb4ee7b
Signed-off-by: Kalyani Chidambaram <kalyanic@nvidia.com>