[MIPS] Malta: use the KERN_ facility level in printk()

This patch adds the KERN_ macros to printk() calls. Where applicable,
spaces are replaced by tabs.

These changes noticeably reduce the number of errors and warnings
reported by the checkpatch.pl script for the malta_int.c file.

Before the patch: total: 47 errors, 20 warnings, 354 lines checked

After the patch: total: 34 errors, 7 warnings, 355 lines checked

No functional changes introduced.

Signed-off-by: Dmitri Vorobiev <dmitri.vorobiev@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>