egl/android: rework device probing

Unlike the other platforms, here we aim do guess if the device that we
somewhat arbitrarily picked, is supported or not.

In particular: when a vendor is _not_ requested we loop through all
devices, picking the first one which can create a DRI screen.

When a vendor is requested - we use that and do _not_ fall-back to any
other device.

The former seems a bit fiddly, but considering EGL_EXT_explicit_device and
EGL_MESA_query_renderer are MIA, this is the best we can do for the
moment.

With those (proposed) extensions userspace will be able to create a
separate EGL display for each device, query device details and make the
conscious decision which one to use.

v2:
 - update droid_open_device_drm_gralloc()
 - set the dri2_dpy->fd before using it
 - return a EGLBoolean for droid_{probe,open}_device*
 - do not warn on droid_load_driver failure (Tomasz)
 - plug mem leak on dri2_create_screen failure (Tomasz)
 - fixup function name typo (Tomasz, Rob)

v3:
 - add forward declaration for droid_load_driver()
Fixes the HAVE_DRM_GRALLOC build (Mauro)
 - split dup() assignment and check in separate lines (Tomasz, Eric)
 - make droid_load_driver() static (Tomasz)
 - drop unused prop_set variable (Tomasz)

v4:
 - rebase
 - fwd declarationi should be for droid_probe_device()

Cc: Robert Foss <[email protected]>
Cc: Tomasz Figa <[email protected]>
Cc: Mauro Rossi <[email protected]>
Signed-off-by: Emil Velikov <[email protected]>
Reviewed-by: Tomasz Figa <[email protected]>
Tested-by: Tomasz Figa <[email protected]>
Tested-by: Tapani Pälli <[email protected]>

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