tplink-safeloader: Patch to handle partitions with alternate names.

tplink-safeloader: Patch to handle partitions with alternate names.

Some devices, specifically Deco M4R-v3 / M5 have partition names that
deviate from the scheme other devices use. They have an added "@0"
and "@1" for some partition names.

The devices have fallback partitions which will be used in case the
device determines that the primary partition set is unbootable.

This patch introduces an option to set these alternate partition names
in the device definition of tplink-safeloader.

Signed-off-by: Ole Kristian Lona <oklo@oklona.net>
Reviewed-by: Sander Vanheule <sander@svanheule.net>