Upgrade ASK kernel base to Linux 6.18.30

Move the custom ASK/NXP kernel build from lf-6.18.2-1.0.0 toward
the upstream stable 6.18.y baseline, currently 6.18.30.

This pulls in upstream stable fixes, including the BPF verifier fix needed
by Cilium. The previous 6.18.2-based kernel triggered:

  verifier bug: REG INVARIANTS VIOLATION (false_reg1)
  reg_bounds_sanity_check()
  bpf_prog_load()
  cilium-agent

The issue is no longer reproduced on 6.18.30 after fresh boot:
Cilium 1.19.2 reports healthy, BPF datapath is active, all controllers are
healthy, cluster health is reachable, and dmesg no longer shows the verifier
warning.

Refresh affected ASK upstream patch splits:
- add bridge br_input patch
- refresh xfrm policy/state patches
- update package/kernel build inputs for 6.18.30

patches/ask/upstream/kernel/0136-net__xfrm__xfrm_policy.c.patch

@@ -1,5 +1,5 @@
 diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
-index 62486f8..3cbe4f8 100644
+index 29c94ee..f9c222f 100644
 --- a/net/xfrm/xfrm_policy.c
 +++ b/net/xfrm/xfrm_policy.c
 @@ -48,6 +48,11 @@
@@ -86,7 +86,7 @@ index 62486f8..3cbe4f8 100644
  ok:
  	xfrm_pols_put(pols, drop_pols);
  	if (dst->xfrm &&
-@@ -3853,6 +3909,34 @@ int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
+@@ -3859,6 +3915,34 @@ int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
  			goto reject;
  		}
  
@@ -118,10 +118,10 @@ index 62486f8..3cbe4f8 100644
 +#endif
 +#endif
 +
+ out:
  		xfrm_pols_put(pols, npols);
  		sp->verified_cnt = k;
- 
-@@ -4328,6 +4412,14 @@ static int __net_init xfrm_net_init(struct net *net)
+@@ -4339,6 +4423,14 @@ static int __net_init xfrm_net_init(struct net *net)
  	if (rv < 0)
  		goto out_sysctl;
  
@@ -136,7 +136,7 @@ index 62486f8..3cbe4f8 100644
  	rv = xfrm_nat_keepalive_net_init(net);
  	if (rv < 0)
  		goto out_nat_keepalive;
-@@ -4335,6 +4427,12 @@ static int __net_init xfrm_net_init(struct net *net)
+@@ -4346,6 +4438,12 @@ static int __net_init xfrm_net_init(struct net *net)
  	return 0;
  
  out_nat_keepalive:
@@ -149,7 +149,7 @@ index 62486f8..3cbe4f8 100644
  	xfrm_sysctl_fini(net);
  out_sysctl:
  	xfrm_policy_fini(net);
-@@ -4349,6 +4447,11 @@ out_statistics:
+@@ -4360,6 +4458,11 @@ out_statistics:
  static void __net_exit xfrm_net_exit(struct net *net)
  {
  	xfrm_nat_keepalive_net_fini(net);