MIPS: pci: Remove KERN_WARN instance inside the mt7620 driver

MIPS: pci: Remove KERN_WARN instance inside the mt7620 driver

commit 8593b18ad348733b5d5ddfa0c79dcabf51dff308 upstream.

Switch the printk() call to the prefered pr_warn() api.

Fixes: 7e5873d3755c ("MIPS: pci: Add MT7620a PCIE driver")
Signed-off-by: John Crispin <john@phrozen.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/15321/
Signed-off-by: James Hogan <jhogan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>