Remove support for the TP-Link WDR4900, as it us currently unable to
load its kernel sure to factory bootloader constraints.
Progress on this topic is tracked in #2491
This adds support for the Sophos RED 15w rev.1 gateway.
It is a branch-office SD-WAN device based on the P1014 networking SoC.
Signed-off-by: David Bauer <mail@david-bauer.net>