radv: fix defining RADV_USE_WSI_PLATFORM

RADV_USE_WSI_PLATFORM was unused in radv_CreateImage().

Fixes: 2a5d7f4926c ("radv: fix missing implementation of creating images from swapchains")
Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/21763>
(cherry picked from commit c87c34bbba3b0d0890c050d34f4b7165b29b7326)
3 files changed