Fix modules patch: ip6_gre.ko not in RPi downstream kernel

ip6_gre.ko exists in Talos upstream module list (v1.12.4) but not
in the RPi downstream kernel build. Only add it to the removal side
of the patch, not our custom module list.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

patches/siderolabs/talos/0001-Patched-for-Raspberry-Pi-5.patch

@@ -11,7 +11,7 @@ diff --git a/hack/modules-arm64.txt b/hack/modules-arm64.txt
 index 3b11b7551..95c3ee669 100644
 --- a/hack/modules-arm64.txt
 +++ b/hack/modules-arm64.txt
-@@ -1,238 +1,191 @@
+@@ -1,238 +1,190 @@
 -kernel/arch/arm64/lib/xor-neon.ko
 +modules.builtin.bin
 +modules.builtin.modinfo
@@ -47,7 +47,6 @@ index 3b11b7551..95c3ee669 100644
 +kernel/crypto/xxhash_generic.ko
 +kernel/crypto/zstd.ko
 +kernel/net/ipv4/ip_gre.ko
-+kernel/net/ipv6/ip6_gre.ko
 +kernel/net/tls/tls.ko
 +kernel/net/openvswitch/vport-gre.ko
 +kernel/drivers/infiniband/sw/rxe/rdma_rxe.ko