Update manta prebuilt kernel (cgroup fixes)

b519f21 cgroup: Fix use after free of cgrp (cgrp->css_sets)
192ccd0 cgroup: Take css_set_lock from cgroup_css_sets_empty()
e512280 usb: gadget: f_accessory: Enabled Zero Length Packet (ZLP) for acc_write

Bug: 16370204
Change-Id: Ia97db3f2694fec5a461aa001004478854f4fa05d
diff --git a/kernel b/kernel
index 71972b4..663d8e1 100644
--- a/kernel
+++ b/kernel
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