Add support for floating point half-width formats. Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> From: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/00b96cd5-91c7-5677-9620-b138c7a92303@linux.intel.com