imx8qm_rom7720_a1: Remove unused function detail_board_ddr_info()

imx8qm_rom7720_a1: Remove unused function detail_board_ddr_info()

detail_board_ddr_info() is not used anywhere, so simply remove it.

This function is only used by Layerscape, not by i.MX.

This was detected by the following sparse warning:

board/advantech/imx8qm_rom7720_a1/imx8qm_rom7720_a1.c:110:6: warning: no previous
prototype for ‘detail_board_ddr_info’ [-Wmissing-prototypes]

Signed-off-by: Alifer Moraes <alifer.wsdm@gmail.com>
Reviewed-by: Oliver Graute <oliver.graute@kococonnector.com>