Drop unnecessary DEVICE_NOOP entries

Providing an explicit no-op function pointer is only necessary for
`.read_resources` and `.set_resources`. All other device-operation
pointers are optional and can be NULL.

Change-Id: I3d139f7be86180558cabec04b8566873062e33be
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/40206
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Edward O'Callaghan <quasisec@chromium.org>
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/drivers/i2c/ptn3460/ptn3460.c

@@ -129,9 +129,7 @@ __weak int mb_adjust_cfg(struct ptn_3460_config *cfg_ptr)
 static struct device_operations ptn3460_ops = {
 	.read_resources		= DEVICE_NOOP,
 	.set_resources		= DEVICE_NOOP,
-	.enable_resources	= DEVICE_NOOP,
 	.init			= ptn3460_init,
-	.final			= DEVICE_NOOP
 };
 
 static void ptn3460_enable(struct device *dev)