ARM: 5877/1: ep93xx: use pr_fmt in core.c

Use pr_fmt to prefix kernel output with the module name.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Acked-by: Ryan Mallon <ryan@bluewatersys.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>