It appears that all SC7280-based devices so far have mpss_mem and
wpss_mem on the same reg with the same size.

Also these memory regions are referenced already in sc7280.dtsi so
that's where they should also be defined.
Signed-off-by: Luca Weiss <luca.weiss@fairphone.com>
Link: https://lore.kernel.org/r/20231208-sc7280-remoteprocs-v3-4-6aa394d33edf@fairphone.com
[bjorn: delete-node &wpss_mem in qcs6490 rb3gen2, and qcm6490 idp]
Signed-off-by: Bjorn Andersson <andersson@kernel.org>