serrano: Remove custom recovery keys

 * Depends on http://review.cyanogenmod.org/#/c/62724/

Change-Id: Ia6a25daed0517afde1e2e28fccc3bbc1d6962852

Conflicts:
	BoardConfigCommon.mk
Merge branch 'cm-11.0' of github.com:Grarak/android_device_samsung_melius-common into cm-11.0