Remove #cpus from arm cpu node

This value is not used by the Linux kernel that's why
let's remove it.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Acked-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Enable fclk by default

Linux drivers are not clk aware that's why enable all fclk
till all drivers are fixed.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>