staging: mt7621-dts: remove sysctl registers from pcie bindings

The sysctl register are already claimed by palmbus, so
pci fails to claim it. Remove registers accordly from DT
bindings.

Fixes: 624c5227: staging: mt7621-dts: add sysctl registers base address to pcie
Reported-by: NeilBrown <neil@brown.name>
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Tested-by: NeilBrown <neil@brown.name>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>