remoteproc: imx_dsp_rproc: use common rproc_elf_load_segments

remoteproc elf loader supports the specific case that segments
have PT_LOAD and memsz/filesz set to zero, so no duplicate
code.

Acked-by: Daniel Baluta <daniel.baluta@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Link: https://lore.kernel.org/r/20220413033038.1715945-3-peng.fan@oss.nxp.com


Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>