imx8mm-*-evk: Split 8M Mini EVK for LPDDR4 and DDR4 variants
The 8M Mini Evaluation Kit has two variants, one for LPDDR4 and one for
DDR4, with two corresponding sets of image components. The current machine
configuration places both sets into a single image and boots for LPDDR4.
The user must manually update the image to make it work for the DDR4
EVK variant.
Simplify the DDR4 case by providing a dedicated machine configuration.
Signed-off-by: Tom Hochstein <tom.hochstein@nxp.com>
