[ARM] 5186/1: metronomefb: convert printk to dev_dbg/err messages

This patch converts the printk messages in metronomefb to dev_dbg/err type
messages.

Signed-off-by: Jaya Kumar <jayakumar.lkml@gmail.com>
Acked-by: Eric Miao <eric.miao@marvell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>