Revert "Revert "comment out TARGET_KERNEL_CUSTOM_TOOLCHAIN""

This reverts commit 20c8b5b0fe6d24b05400dc71936e2cb0e25df93b.

Conflicts:
	BoardConfig.mk

Change-Id: I8391f0f004a409e68029feb06552046efed33e69

Conflicts:
	BoardConfig.mk