ram: merge ram timings from pattyboi, ziyann and freshgiammi

Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>
Signed-off-by: Dan Trifan <jimsth@gmail.com>
ram: merge newer timings from https://github.com/freshgiammi/omap/commit/3daf78872bd9f78640682275238b59bc27eee0ec

Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>
Signed-off-by: Dan Trifan <jimsth@gmail.com>