imx_sdp: move jump command out of main download function
imx_sdp: move jump command out of main download function

Move jump command out of main download function. The commit
is simplifying code and properly jumps to cleanup in case the
jump command fails. Otherwise behavior remains the same.

Signed-off-by: Stefan Agner <8bf81831f67286fff829779134e88c94b37210a1@toradex.com>

bwalle/imx_usb_loader,boundarydevices/imx_usb_loader