hikey: BoardConfig.mk: Set command line properly for abootimg support

In prep for abootimg support, set the kernel command line
properly.

Change-Id: I5a0ab9b7342c45c0f3529cd70c38d1ace940ce5f
Signed-off-by: Haojian Zhuang <haojian.zhuang@linaro.org>
[jstultz: Reworked and split out from Haojian's original patch]
Signed-off-by: John Stultz <john.stultz@linaro.org>
1 file changed