tools: ynl-gen: support full range of min/max checks for integer values

Extend the support to full range of min/max checks.
None of the existing YNL families required complex integer validation.

The support is less than trivial, because we try to keep struct nla_policy
tiny the min/max members it holds in place are s16. Meaning we can only
express checks in range of s16. For larger ranges we need to define
a structure and link it in the policy.

Link: https://lore.kernel.org/r/20231018163917.2514503-3-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Documentation/netlink/genetlink-c.yaml

@@ -184,6 +184,9 @@ properties:
                   min:
                     description: Min value for an integer attribute.
                     type: integer
+                  max:
+                    description: Max value for an integer attribute.
+                    type: integer
                   min-len:
                     description: Min length for a binary attribute.
                     $ref: '#/$defs/len-or-define'

Documentation/netlink/genetlink-legacy.yaml

@@ -227,6 +227,9 @@ properties:
                   min:
                     description: Min value for an integer attribute.
                     type: integer
+                  max:
+                    description: Max value for an integer attribute.
+                    type: integer
                   min-len:
                     description: Min length for a binary attribute.
                     $ref: '#/$defs/len-or-define'

Documentation/netlink/genetlink.yaml

@@ -157,6 +157,9 @@ properties:
                   min:
                     description: Min value for an integer attribute.
                     type: integer
+                  max:
+                    description: Max value for an integer attribute.
+                    type: integer
                   min-len:
                     description: Min length for a binary attribute.
                     $ref: '#/$defs/len-or-define'