package/freescale-imx/firmware-imx: copy all (lp)ddr files unconditionaly

package/freescale-imx/firmware-imx: copy all (lp)ddr files unconditionaly

In mainline u-boot more and more imx8 boards are switched to binman
to create the imx specific image (flash.bin). To support this the
(lp)ddr firmware training files are needed. For this to work all files
should be made available to the U-Boot build.

Signed-off-by: Heiko Thiery <heiko.thiery@gmail.com>
Reviewed-by: Gary Bisson <gary.bisson@boundarydevices.com>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>