vulkan: Common vk_format_get_component_bits

vulkan: Common vk_format_get_component_bits

RADV and PowerVR use the same implementation.
Turnip does use a slightly modified version but the helper only has one
use -> just inline it and get rid of turnip's vk_format.h.

Signed-off-by: Konstantin Seurer <konstantin.seurer@gmail.com>
Reviewed-by: Jason Ekstrand <jason.ekstrand@collabora.com>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Emma Anholt <emma@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17515>