usb: gadget: atmel: Replace printf() and pr_err() by log_err()

To have a uniform printing function, also drop linux/printk.h as no
longer used.

Signed-off-by: Zixun LI <admin@hifiphile.com>
Link: https://lore.kernel.org/r/20240725153204.358925-3-admin@hifiphile.com
Signed-off-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
1 file changed