usb: gadget: atmel: Rename atmel_usba_start()/_stop() to usba_udc_enable()/_disable()

usb: gadget: atmel: Rename atmel_usba_start()/_stop() to usba_udc_enable()/_disable()

Rename atmel_usba_start() / atmel_usba_stop() to usba_udc_enable()
/ usba_udc_disable(), remove atmel_ prefix to be inline with other
functions. Also avoid confusion with DM start() / stop() functions.

Signed-off-by: Zixun LI <admin@hifiphile.com>
Reviewed-by: Marek Vasut <marex@denx.de>
Reviewed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Link: https://lore.kernel.org/r/20240725153204.358925-6-admin@hifiphile.com
Signed-off-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>