Add RAM Timings for new phyCORE-AM335x-R2 SoM with 512MB (MT41K256M16TW107IT). Signed-off-by: Arnd Beuscher <a.beuscher@phytec.de> Sigend-off-by: Teresa Remmet <t.remmet@phytec.de> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>