ARM: dts: rmobile: Enable eMMC DDR52 modes on Gen3 Salvator-X(S),ULCB,Ebisu

Enable DDR52 modes, since the SD core supports correct switching now.
For completeness, list HS200 modes, however those were already enabled.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>