usb: dwc3-generic: Reorder include

usb: dwc3-generic: Reorder include

Reorder include following rules available here :
https://docs.u-boot.org/en/latest/develop/codingstyle.html#include-files

Remove useless include files.

Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Cc: Marek Vasut <marex@denx.de>
Reviewed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Link: https://lore.kernel.org/r/20250130163547.512990-5-patrice.chotard@foss.st.com
Signed-off-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>