drm/tests: Add helper to create mock plane

[ Upstream commit 7a48da0f ]

We're going to need a full-blown, functional, KMS device to test more
components of the atomic modesetting infrastructure.

Let's add a new helper to create a dumb, mocked, primary plane. By
default, it will create a linear XRGB8888 plane, using the default
helpers.

Reviewed-by: Maíra Canal <mcanal@igalia.com>
Signed-off-by: Maxime Ripard <mripard@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240222-kms-hdmi-connector-state-v7-3-8f4af575fce2@kernel.org


Stable-dep-of: 70f29ca3 ("drm/tests: cmdline: Fix drm_display_mode memory leak")
Signed-off-by: Sasha Levin <sashal@kernel.org>