hammerhead: remove custom toolchain for now

kernel has randomly start up problems with linaro 4.8. Use default toolchain
till problem is identified

Change-Id: Ib4d9c1d9151297f86782b82cc7e462b6ea2a29a0
Merge remote-tracking branch 'slim/lp5.0' into lp5.0

Signed-off-by: Randy DuCharme <radio.ad5gb@gmail.com>

Conflicts:
	BoardConfig.mk
Merge branch 'lp5.0' of github.com:Validus-Shamu/device_lge_hammerhead into lp5.0

Signed-off-by: Randy DuCharme <radio.ad5gb@gmail.com>

Conflicts:
	BoardConfig.mk