octeon: ubnt-edgerouter: Disable PCIe

Some devices lock up on PCIe initialization:

[   64.309697] PCIe: Port 0 in endpoint mode, skipping.
[   64.320496] PCIe: Initializing port 1
[   64.325257] PCIe: BIST FAILED for port 1 (0xffffffffffffffff)
(system hangs here)

Given the ER contains no PCIe peripherals, has no way to attach any
and the stock kernel doesn't have PCIe support either, just disable it.

Signed-off-by: Jakob Haufe <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/15992
Signed-off-by: Robert Marko <[email protected]>

target/linux/octeon/image/Makefile

@@ -42,7 +42,8 @@ define Device/itus_shield-router
 endef
 TARGET_DEVICES += itus_shield-router
 
-ER_CMDLINE:=-mtdparts=phys_mapped_flash:640k(boot0)ro,640k(boot1)ro,64k(eeprom)ro root=/dev/mmcblk0p2 rootfstype=squashfs,ext4 rootwait
+# Disable PCIe on ER as it doesn't have PCIe peripherals and some devices lock up on initialization
+ER_CMDLINE:=-mtdparts=phys_mapped_flash:640k(boot0)ro,640k(boot1)ro,64k(eeprom)ro root=/dev/mmcblk0p2 rootfstype=squashfs,ext4 rootwait pcie_octeon.pcie_disable=1
 define Device/ubnt_edgerouter
   DEVICE_VENDOR := Ubiquiti
   DEVICE_MODEL := EdgeRouter