ppp: Add target-specific patch for PPPoATM on BCM
Add patch to PPPoATM plugin to make PPPoATM work on Broadcom platforms. The patch is based on what Broadcom does in their bcm963xx SDK version 5.04L.02p1 at userspace/gpl/apps/ppp/ppp-2.4.8/pppd/plugins/pppoatm/pppoatm.c compared to vanilla upstream ppp-2.4.8.
It makes PPPoATM work on Broadcom platforms and is only applied when compiling for the iopsys-brcm63xx-arm target.
Edited by Andreas Gnau