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

"amlogic,meson-gxbb-scp-shmem" is already in the Generic on-chip SRAM
binding though "amlogic,meson-gxbb-scpi" is missing which is now added.
Also remove the whole old text format binding for the same.

Cc: Rob Herring <robh+dt@kernel.org>
Cc: Kevin Hilman <khilman@baylibre.com>
Cc: Neil Armstrong <narmstrong@baylibre.com>
Cc: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Link: https://lore.kernel.org/r/20210601224904.917990-5-sudeep.holla@arm.comSigned-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/arm/amlogic,scpi.txt

@@ -5,18 +5,6 @@ Required properties
 
 - compatible : should be "amlogic,meson-gxbb-scpi"
 
-AMLOGIC SRAM and Shared Memory for SCPI
-------------------------------------
-
-Required properties:
-- compatible : should be "amlogic,meson-gxbb-sram"
-
-Each sub-node represents the reserved area for SCPI.
-
-Required sub-node properties:
-- compatible : should be "amlogic,meson-gxbb-scp-shmem" for SRAM based shared
-		memory on Amlogic GXBB SoC.
-
 Sensor bindings for the sensors based on SCPI Message Protocol
 --------------------------------------------------------------
 SCPI provides an API to access the various sensors on the SoC.

Documentation/devicetree/bindings/sram/sram.yaml

@@ -28,6 +28,7 @@ properties:
     contains:
       enum:
         - mmio-sram
+        - amlogic,meson-gxbb-sram
         - arm,juno-sram-ns
         - atmel,sama5d2-securam
         - rockchip,rk3288-pmu-sram