ramips: dts: correct WiFi band node reg size for Gemtek WVRTM-130ACN

ramips: dts: correct WiFi band node reg size for Gemtek WVRTM-130ACN

The #address-cells should be 1 according to the dt-binding document.
This patch fixes the following dtc warnings:

../dts/mt7621_gemtek_wvrtm-130acn.dts:46.4-14: Warning (reg_format): /pcie@1e140000/pcie@0,0/wifi@0,0/band@0:reg: property has invalid length (4 bytes) (#address-cells == 2, #size-cells == 0)
../dts/mt7621_gemtek_wvrtm-130acn.dts:54.4-14: Warning (reg_format): /pcie@1e140000/pcie@0,0/wifi@0,0/band@1:reg: property has invalid length (4 bytes) (#address-cells == 2, #size-cells == 0)

Signed-off-by: Shiji Yang <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/18242
Signed-off-by: Hauke Mehrtens <[email protected]>