ARM: zynq: DT: Enable all FCLKs by default

The fclk-enable property is set to 0 which disables all FCLKs.
Enable all FCLKs so they can be used as clock sources in the
programmable logic.

Signed-off-by: Christian Kohn <christian.kohn@xilinx.com>
Acked-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/b1308dc1f14f8eb24662019f7376c959e5e763b8.1665567031.git.michal.simek@amd.com