make.sh: Add config check for embbeded kernel dtb

We add CONFIG_EMBED_KERNEL_DTB for user to decide whether
they wan't to pack kernel dtb or not, but not pack kernel
dtb by default if dts/kern.dtb w

make.sh: Add config check for embbeded kernel dtb

We add CONFIG_EMBED_KERNEL_DTB for user to decide whether
they wan't to pack kernel dtb or not, but not pack kernel
dtb by default if dts/kern.dtb was found.

This config check report error if legacy behaviour was
found.

Signed-off-by: Joseph Chen <chenjh@rock-chips.com>
Change-Id: Ia19fc0e512ae28ca1530473b761cb5afe0c4903a

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