ramips: correct the PCIe port number for Unielec u7621-01

ramips: correct the PCIe port number for Unielec u7621-01

MT7621 gets a new PCIe driver in the 5.15+ kernel. Allocating wrong PCIe
port will cause the PCIe NIC to not work properly. This commit fixes
the wrong port numbers on Unielec u7621-01.

According to the bootlog, MT7612E (5 GHz) is connected to pcie2, and
MT7603E (2 GHz) is connected to pcie1:

[    1.294844] mt7621-pci 1e140000.pcie: pcie0 no card, disable it (RST & CLK)
[    1.308635] mt7621-pci 1e140000.pcie: PCIE1 enabled
[    1.318277] mt7621-pci 1e140000.pcie: PCIE2 enabled

Also correct the led activity for the MT7603e - not used on the MT7612e

Signed-off-by: David Bentham <db260179@gmail.com>
(cherry picked from commit 39e55bdbe27a09579658178796a9b732e126e703)
Signed-off-by: David Bentham <db260179@gmail.com>