dt-bindings: firmware: arm,scmi: Move arm,scmi-shmem to json schema

dt-bindings: firmware: arm,scmi: Move arm,scmi-shmem to json schema

Move the SRAM and shared memory binding for SCMI into the existing
Generic on-chip SRAM. We just need to update the compatible list and
there-by remove the whole old text format binding for the same.

Cc: Rob Herring <robh+dt@kernel.org>
Cc: Cristian Marussi <cristian.marussi@arm.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Link: https://lore.kernel.org/r/20210601224904.917990-3-sudeep.holla@arm.com
Signed-off-by: Rob Herring <robh@kernel.org>