android: capabilities: Centralize RAW support check

The validation of RAW stream support is performed in two different
places:

- At initializeStreamConfigurations() time, by verifying that the
  libcamera format associated with HAL_PIXEL_FORMAT_BLOB is a Raw format
  and ensuring the Camera successfully validates it
- As initializeStaticMetadata() time by generating a CameraConfiguration
  for the Raw stream role and ensuring it is a Raw format with a 16 bit
  depth

The first check is used to build the list of supported Raw stream
resolutions. The latter is used to register the
ANDROID_REQUEST_AVAILABLE_CAPABILITIES_RAW capability.

As building the list of supported Raw streams doesn't serve any
purpose if the RAW capability is not registered, centralize the Raw
format support verification at initializeStreamConfigurations() time by
ensuring the supported format is a Raw one with a 16 bit depth.

Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

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