egl: fix platform selection

Add missing "device" platform

v2: Add the missing platform (Eric)

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reported-by: Jean Hertel <jean.hertel@hotmail.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=111529


Fixes: d6edccee ("egl: add EGL_platform_device support")
Reviewed-by: Eric Engestrom <eric@engestrom.ch>
(cherry picked from commit 6775a524)