dt-bindings: riscv: Add Zalasr ISA extension description

Add description for the Zalasr ISA extension

Signed-off-by: Xu Lu <luxu.kernel@bytedance.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://patch.msgid.link/20251020042056.30283-3-luxu.kernel@bytedance.com
Signed-off-by: Paul Walmsley <pjw@kernel.org>

Author: luxukernel

Documentation/devicetree/bindings/riscv/extensions.yaml

@@ -242,6 +242,11 @@ properties:
             is supported as ratified at commit 5059e0ca641c ("update to
             ratified") of the riscv-zacas.
 
+        - const: zalasr
+          description: |
+            The standard Zalasr extension for load-acquire/store-release as frozen
+            at commit 194f0094 ("Version 0.9 for freeze") of riscv-zalasr.
+
         - const: zalrsc
           description: |
             The standard Zalrsc extension for load-reserved/store-conditional as