common: add board specific hook for os pre-boot config

Some boards require specific configuration prior to booting the kernel.
For instance, our boards require shutting down the display to avoid
fading transitions before the drivers are reloaded by the kernel. This
can be facilitated by adding an extra hook during the os booting
process.

Signed-off-by: Gerard Salvatella <gerard.salvatella@toradex.com>
Acked-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>

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