mako: update prebuilt kernel

4fa846b msm: kgsl: Remove now uneeded GPU event code
ad0defd msm: kgsl: Take the device mutex earlier when sending cmds to GPU

b/10908929 - (speculative fix) APR: kernel BUG at drivers/gpu/msm/kgsl_pwrctrl.c
Signed-off-by: Iliyan Malchev <malchev@google.com>

Change-Id: I7466e23662c87bdbc143fc4450c68e7ac09c355d
diff --git a/kernel b/kernel
index 3534803..5a8f6a5 100644
--- a/kernel
+++ b/kernel
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