dt-bindings: chosen: Add "linux,smbios3-entrypoint" property

This property allows a bootloader to pass the physical address of the
SMBIOSv3 entrypoint structure to the kernel via the /chosen node.

This provides a fallback mechanism where the standard EFI
configuration tables are not available but SMBIOS data is
still present.

Signed-off-by: adriana <[email protected]>

Author: adrianicolae

dtschema/schemas/chosen.yaml

@@ -167,6 +167,11 @@ properties:
       will assign devices in its usual manner, otherwise it will not try to
       assign devices and instead use them as they are configured already.
 
+  smbios3-entrypoint:
+    $ref: /schemas/types.yaml#/definitions/uint64
+    description:
+      The 64-bit physical address of the SMBIOSv3 entry point structure.
+
   stdout-path:
     $ref: types.yaml#/definitions/string
     pattern: '^[a-zA-Z0-9@/,+\-._]*(:[0-9]*[noe]?[78]?[r]?)?$'