manta: Update prebuilt kernel (GPU DVFS)

458fbd5 Merge branch 'android-exynos-3.4' into android-exynos-manta-3.4
508bec12 mali: Removed extraneous zeroing of idle/busy times

Bug: 13510803
Change-Id: Ie69c28daeaa5ab775217970cbe9ebdc717439f0b
1 file changed