luna-sysmgr/webappmanager/luna-sysmgr-common: add support for different variants of tuna/grouper

Signed-off-by: Simon Busch <morphis@gravedo.de>
distro: webos: set default of WEBOS_TARGET_MACHINE_IMPL to device

Having the default set to device makes it easier to support different target machines
without adding webos specific overrides to their machine layer.

Signed-off-by: Simon Busch <morphis@gravedo.de>
nyx-modules: bump SRCREV to support maguro/toro/toroplus/tilapia

Signed-off-by: Simon Busch <morphis@gravedo.de>