linux: Sync generic 4.9 RT kernel with other LKFT kernels
linux: Sync generic 4.9 RT kernel with other LKFT kernels

A few things are changed:
* add the lkft.config fragment,
* remove NUMA config (as it went to lkft.config),
* drop selftests/sync patch,
* add a few configs to work around a few bugs.

Signed-off-by: Daniel Díaz <81c1e6f46dfb75ebff90afb11720614d43e597b3@linaro.org>

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