dt-bindings: mfd: atmel,hlcdc: Convert to DT schema format

Convert the atmel,hlcdc binding to DT schema format.

Align clocks and clock-names properties to clearly indicate that the LCD
controller expects lvds_pll_clk when interfaced with the lvds display. This
alignment with the specific hardware requirements ensures accurate device tree
configuration for systems utilizing the HLCDC IP.

Signed-off-by: Dharma Balasubiramani <dharma.b@microchip.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20240202001733.91455-4-dharma.b@microchip.com


Signed-off-by: Lee Jones <lee@kernel.org>