Staging: rtl8192e: Fixed style warning relating to printk()

This patch fixes following checkpatch.pl warning in file rtl_dm.c:

WARNING: Prefer [subsystem eg: netdev]_info([subsystem]dev, ... then dev_info(dev, ... then pr_info(...  to printk(KERN_INFO .

Signed-off-by: Vaishali Thakkar <vthakkar1994@gmail.com>
Acked-by: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>