feat(ff-a): change manifest messaging method

Align documentation with changes of messaging method for partition
manifest:
      - Bit[0]: support for receiving direct message requests
      - Bit[1]: support for sending direct messages
      - Bit[2]: support for indirect messaging
      - Bit[3]: support for managed exit
Change the optee_sp_manifest to align with the new messaging method
description.
Signed-off-by: Maksims Svecovs <maksims.svecovs@arm.com>
Change-Id: I333e82c546c03698c95f0c77293018f8dca5ba9c

docs/components/ffa-manifest-binding.rst

@@ -106,14 +106,14 @@ Partition Properties
      The "compatible" must be the string "arm,ffa-manifest-rx_tx-buffer".
 
 - messaging-method [mandatory]
-   - value type: <u32>
-   - Specifies which messaging methods are supported by the partition:
-
-      - 0x0: direct messaging method
-      - 0x1: indirect messaging method
-      - 0x2: both direct and indirect messaging methods
-      - 0x3: direct messaging method with managed exit support
-      - 0x4: both messaging methods with managed exit support
+   - value type: <u8>
+   - Specifies which messaging methods are supported by the partition, set bit
+     means the feature is supported, clear bit - not supported:
+
+      - Bit[0]: support for receiving direct message requests
+      - Bit[1]: support for sending direct messages
+      - Bit[2]: support for indirect messaging
+      - Bit[3]: support for managed exit
 
 - has-primary-scheduler
    - value type: <empty>

plat/arm/board/fvp/fdts/optee_sp_manifest.dts

@@ -25,7 +25,7 @@
 	entrypoint-offset = <0x1000>;
 	xlat-granule = <0>; /* 4KiB */
 	boot-order = <0>;
-	messaging-method = <0>; /* Direct messaging only */
+	messaging-method = <3>; /* Direct messaging only */
 	run-time-model = <1>; /* Run to completion */
 
 	/* Boot protocol */