st/mesa: call resource_changed when binding a EGLImage to a texture

When a EGLImage is newly bound to a texture, we need to make sure the
driver is informed that the resource might have changed. Fixes stale
texture content on Etnaviv when binding an existing EGLImage to an
existing texture object.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
(cherry picked from commit 501d0ede)