uboot-imx

MLK-21904 epdc: Fix EPDC waveform and logo file loading failure

Since new u-boot will prohibit loading image into memory which is used
by u-boot, like (SP, malloc, relocate). When we allocate waveform buffer
and logo buffer from malloc, loading to them will fail.

Fix the issue by using system load address as a trampoline. Load the image
to system load address first, then copy the data to buffers

Signed-off-by: Ye Li <ye.li@nxp.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>