The default BoardConfig.mk is too old to lead mistakes to our customers.
So let's update it in this patch. The new BoardConfig.mk is synced from
BoardConfig-minievb-v10.mk by the following command:
cp BoardConfig-minievb-v10.mk BoardConfig.mk
Change-Id: Iec7a80b2c151c0eec1c26b6326664392de253a75
Signed-off-by: Zhichao Yu <zhichao.yu@rock-chips.com>