clk: si570: Add a driver for SI570 oscillators

Add a driver for SILabs 570, 571, 598, 599 programmable oscillators.
The devices generate low-jitter clock signals and are reprogrammable via
an I2C interface.

Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
Signed-off-by: Mike Turquette <mturquette@linaro.org>
(cherry picked from commit c3703766a3641c682b7ea4d649619ef1836a952f)
drm: xilinx: crtc: Add CCF support for pixel clock

Replace dependency on si570 using CCF interface.

Signed-off-by: Hyun Kwon <hyunk@xilinx.com>
misc: si570: Remove legacy driver

Remove the legacy driver for the Si570 oscillator since a mainline
driver is available in drivers/clk/clk-si570.c.

Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
drm: xilinx: si570

defconfig and dts
drm: adv7511: dts

change the clock-delay to 0x7
arm: zynq: DT: Migrate si570 to new driver

Migrate the Si570 nodes to use the new CCF driver for the Si570
oscillator.

Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
arm: dts: Add dts for zc706 vdf

Add dts for zc706 vdf