Update to latest kernel

Commit 2815337c08c5e5c1a5a42cc066a3239ea145ade0 from
https://github.com/Lloir/android_kernel_htc_enrc2b/commits/cm-10.2

Change-Id: Idade516a0c473cbe15935527245e68fffb642018
Merge pull request #1 from CyanogenMod/cm-10.2

Update to latest kernel