v4l: ioctl: Use %p4cc printk modifier to print FourCC codes

Now that we can print FourCC codes directly using printk, make use of the
feature in V4L2 core.

Signed-off-by: Sakari Ailus <[email protected]>
Acked-by: Mauro Carvalho Chehab <[email protected]>
Reviewed-by: Petr Mladek <[email protected]>
Reviewed-by: Andy Shevchenko <[email protected]>
Signed-off-by: Thomas Zimmermann <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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