RDMA/core: Remove unused ibdev_printk

The last use of ibdev_printk() was removed in 2019 by
commit b2299e83 ("RDMA: Delete DEBUG code")

Remove it.

Note: The __ibdev_printk() is still used in the idev_err etc functions
so leave that.

Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
Link: https://patch.msgid.link/20241221014021.343979-4-linux@treblig.org


Signed-off-by: Leon Romanovsky <leon@kernel.org>