dt-bindings: firmware: arm,scmi: support for parameter in smc/hvc call

dt-bindings: firmware: arm,scmi: support for parameter in smc/hvc call

Currently, smc/hvc calls are made with smc-id only. The parameters are
all set to zeros. This change defines a new compatible string that can
be used to pass shmem address(4KB-page, offset) as two parameters in
SMC/HVC doorbell.

This is useful when multiple scmi instances are used with common smc-id.

Signed-off-by: Nikunj Kela <quic_nkela@quicinc.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Link: https://lore.kernel.org/r/20230506182428.25343-2-quic_nkela@quicinc.com
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>