Two fixes for omap variants for v4.16-rc cycle

Fix insecure W+X mapping warning for SRAM for omaps that
don't yet use drivers/misc/*sram*.c code.

Also fix dmtimer probe for omap16xx devices that was noticed
with the pending dmtimer move to drivers. It seems this has
been broken for a while and is a non-critical for booting.
It is needed for PM on omap16xx though.
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