linux: update patches to 3.15-rc3
linux (3.15): mceusb xhci fix

source: https://patchwork.linuxtv.org/patch/23780/

fixed minor if (( => if ( typos
fixed mce_dbg => dev_dbg
Merge pull request #3151 from stefansaraev/linux315

linux (3.15): update patches. pick mceusb fix