MLK-18451: mxc-jpeg: Fix jpeg encoder output

Use two chained descriptors for encoder (config desc & encode desc),
they are set-up in new function mxc_jpeg_config_enc_desc.

Refactor function mxc_jpeg_enc_config, in order for the encoder to
function correctly, the CAST_MODE register needs to be written after
the descriptor(s) are ready.

Set-up decoder descriptor in new function mxc_jpeg_config_dec_desc,
this was previously done in mxc_jpeg_device_run, which is
leaner & cleaner now.

Function mxc_jpeg_go cannot be used both for encoder and decoder, because
the CAST IP control registers are different, the decoder has CTRL
(offset 0x34) while the encoder has MODE register (offset 0x0).
So, have two functions instead: mxc_jpeg_go_enc and mxc_jpeg_go_dec.

Function mxc_jpeg_reset had no purpose anymore, instead use
mxc_jpeg_sw_reset, for soft reset.

Add function mxc_jpeg_set_l_endian.

Signed-off-by: Mirela Rabulea <mirela.rabulea@nxp.com>