android: capabilities: Cap frame rate to 30 FPS

Limit the reported minumum frame duration to 30 FPS.

The reason to do is to bring the libcamra HAL in par with the Intel
HAL implementation on IPU3 platform, where 30FPS is the frame rate used
to perform quality tuning in the closed-source IPA module and has been
validated as the most efficient rate for the power/performace budget.

This change bring into the HAL a platform specific constraints, which
might be opportune for most platforms but should rather be configurable
by system integrators. Record that with a \todo entry.

Also record that, even if we report a lower frame rate, we currently
do not limit what the camera actually produce.

Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

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