arm64: zynqmp: Switch SOM to shared psu configuration

arm64: zynqmp: Switch SOM to shared psu configuration

Previous psu init was targeting SOM + KV260 carrier card and also contain
configurations for other devices on carrier card. This config is removing
all expected configurations for CC and let U-Boot to handle all of it self.
This configuration is designed for SOM itself (and I would bet without
eMMC).

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Link: https://lore.kernel.org/r/5782131058dc372befd3fdb4dceabeea5ba56606.1637236693.git.michal.simek@xilinx.com