MIPS: ath79: remove superfluous alignment checks from pci-ar724x.c

The alignment of the 'where' parameters are checked
in the core PCI code already.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/3492/


Signed-off-by: Ralf Baechle <ralf@linux-mips.org>