configs: Make USB_GADGET_MANUFACTURER consistent over all PHYTEC boards

Set CONFIG_USB_GADGET_MANUFACTURER to PHYTEC for all PHYTEC boards.

Signed-off-by: Benjamin Hahn <B.Hahn@phytec.de>
Acked-by: Wadim Egorov <w.egorov@phytec.de>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
Reviewed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Link: https://lore.kernel.org/r/20240503-wip-bhahn-bspimx8m-3196-v1-1-855c7242151f@phytec.de


Signed-off-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>