[ Upstream commit0ff15a86d0] Add a fixed regulator and use it as power supply for DSI panel. Fixes:18c8866266("ARM: dts: stm32: Add display support on stm32f469-disco") Signed-off-by: Benjamin Gaignard <benjamin.gaignard@st.com> Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com> Signed-off-by: Sasha Levin <sashal@kernel.org>