ramips: fix PCIe port number for ZBT WE3526

ramips: fix PCIe port number for ZBT WE3526

From the kernel log, we are using PCIe port 1 and 2.

dmesg:
```
[ 0.963526] mt7621-pci 1e140000.pcie: pcie0 no card, disable it (RST & CLK)
[ 0.970432] mt7621-pci 1e140000.pcie: PCIE1 enabled
[ 0.975312] mt7621-pci 1e140000.pcie: PCIE2 enabled
[ 1.071442] pci 0000:01:00.0: [14c3:7662] type 00 class 0x028000
[ 1.130382] pci 0000:02:00.0: [14c3:7603] type 00 class 0x028000
```

Fixes: https://github.com/openwrt/openwrt/issues/16000
Signed-off-by: Shiji Yang <yangshiji66@qq.com>
Link: https://github.com/openwrt/openwrt/pull/16009
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>