libsdl2: upgrade 2.28.5 -> 2.30.0

libsdl2: upgrade 2.28.5 -> 2.30.0

License-Update: Copyright year updated to 2024.

ChangeLog (https://github.com/libsdl-org/SDL/releases/tag/release-2.30.0):
* Added support for 2 bits-per-pixel indexed surface formats
* Added the function SDL_GameControllerGetSteamHandle() to get the Steam
  API handle for a controller, if available
* Added the event SDL_CONTROLLERSTEAMHANDLEUPDATED which is sent when
  the Steam API handle for a controller changes. This could also change
  the name, VID, and PID of the controller.
* Added the environment variable SDL_LOGGING to control default log
  output

Signed-off-by: Yi Zhao <yi.zhao@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>