arm64: dts: renesas: r8a779f0: Revise renesas,ipmmu-main

Since IMSSTR register was undocumented on the latest datasheet and
dt-bindings of renesas,ipmmu-vmsa was updated about
the renesas,ipmmu-main property, revise the property on each cache
IPMMU node.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Link: https://lore.kernel.org/r/20230123013448.1250991-2-yoshihiro.shimoda.uh@renesas.com


[geert: Drop indices from renesas,ipmmu-main properties]
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>