drm: meson: rename driver name to meson-drm

The platform driver name is currently "meson" which can lead to some
confusion, this patch renames it to "meson-drm" and removes the owner
attribute since is always added by __platform_driver_register called by the
module_platform_driver() macro.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Acked-by: Daniel Vetter <daniel@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1486028864-19622-3-git-send-email-narmstrong@baylibre.com