MIPS: pci: Remove duplicate define in mt7620 driver

An invalid and duplicate define has gone unnoticed for some time. lets
remove it. The correct define is 3 lines below.

Fixes: 7e5873d3

 ("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/15320/


Signed-off-by: James Hogan <jhogan@kernel.org>