Update Linux kernel prebuilt

Latest commit in third_party/linux was tagged as v4.19.13. This changes
the kernel's vermagic value, thus requiring the prebuilt to be updated.

Change-Id: I7abb7e133c190a3423e28b45bc42dc2c1ccaf6e0
diff --git a/linux-aarch64/linux/vmlinuz b/linux-aarch64/linux/vmlinuz
index 5c90244..d49b951 100755
--- a/linux-aarch64/linux/vmlinuz
+++ b/linux-aarch64/linux/vmlinuz
Binary files differ