doc: Update the cot-binding for nv-counter node

Updated the cot-binding documentation to add 'id'
property for the trusted and non-trusted nv-counters.
Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
Change-Id: If1c628c5b90fe403dd96c7cd0cd04f37288c965c

docs/components/cot-binding.rst

@@ -279,6 +279,10 @@ non-volatile counter node binding definition
                     Description: Contains various non-volatile counters present in the platform.
 
             PROPERTIES
+                - id
+                    Usage: Required for every nv-counter with unique id.
+
+                    Value type: <u32>
 
                 - reg
                     Usage:
@@ -301,21 +305,21 @@ Below is non-volatile counters example for ARM platform
 
 .. code:: c
 
-   non-volatile-counters {
+   non_volatile_counters: non_volatile_counters {
         compatible = "arm, non-volatile-counter";
         #address-cells = <1>;
         #size-cells = <0>;
 
-        counters {
         trusted-nv-counter: trusted_nv_counter {
+           id  = <TRUSTED_NV_CTR_ID>;
            reg = <TFW_NVCTR_BASE>;
            oid = TRUSTED_FW_NVCOUNTER_OID;
         };
+
         non_trusted_nv_counter: non_trusted_nv_counter {
+           id  = <NON_TRUSTED_NV_CTR_ID>;
            reg = <NTFW_CTR_BASE>;
            oid = NON_TRUSTED_FW_NVCOUNTER_OID;
-
-            };
         };
    };