BEFS: logging cleanup

BEFS: logging cleanup

Summary:
 - all printk(KERN_foo converted to pr_foo()
 - add pr_fmt and remove redundant prefixes
 - convert befs_() to va_format (based on patch by Joe Perches)
 - remove non standard %Lu
 - use __func__ for all debugging

[[email protected]: fix printk warnings, reported by Fengguang]
Signed-off-by: Fabian Frederick <[email protected]>
Cc: Joe Perches <[email protected]>
Cc: Fengguang Wu <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>