egl: reorder code in _eglQueryDevicesEXT, add *swrast variable

This is a preparation for the next commit. No change in behavior.

Reviewed-by: Yogesh Mohan Marimuthu <yogesh.mohanmarimuthu@amd.com>
(cherry picked from commit 59527150640e1f62cbc69aa5a28494ce8b119fea)

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/28885>
1 file changed