qualcommax: ipq50xx: backport upstreamed patches for adding ipq5018 CMN PLL support

qualcommax: ipq50xx: backport upstreamed patches for adding ipq5018 CMN PLL support

Use upstreamed patches for adding IPQ CMN PLL driver support and its
node and clocks to the DTS accordingly.

In addition, set clock-div and clock-mult properties instead of the
frequency itself for the XO board clock in all board files as it's
converted to a fixed factor clock.

Signed-off-by: George Moussalem <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/19890
Signed-off-by: Robert Marko <[email protected]>