build/debian: Add memory balloon patch to our Debian kernel

Patch was generated from https://android-kvm.googlesource.com/linux/+/refs/heads/keirf/balloon-6.1

Bug: 363985291
Bug: 383173744
Test: ./build_in_container.sh -k
Test: ./build_in_container.sh -a aarch64 -k

Change-Id: If616490896d39d9cbdb4a5ad2a0d9b819d21fc58
diff --git a/build/debian/kernel_patches/series b/build/debian/kernel_patches/series
new file mode 100644
index 0000000..573a1fb
--- /dev/null
+++ b/build/debian/kernel_patches/series
@@ -0,0 +1,2 @@
+# AVF patches
+avf/arm64-balloon.patch