Added simple BLE Steam Controller support on all platforms

This is still disabled by default via the hint SDL_HINT_JOYSTICK_HIDAPI_STEAM

include/SDL_hints.h

@@ -817,7 +817,7 @@ extern "C" {
 #define SDL_HINT_JOYSTICK_HIDAPI_STADIA "SDL_JOYSTICK_HIDAPI_STADIA"
 
 /**
- *  \brief  A variable controlling whether the HIDAPI driver for Steam Controllers should be used.
+ *  \brief  A variable controlling whether the HIDAPI driver for Bluetooth Steam Controllers should be used.
  *
  *  This variable can be set to the following values:
  *    "0"       - HIDAPI driver is not used