arm64: dts: zynqmp: Remove clock-names from GEM in zynqmp-clk-ccf.dtsi

Remove clock-names from GEM nodes from clk-ccf because they should be only
present in zynqmp.dtsi. And as is visible both clock-names defined didn't
really match.

Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/24ce27f91a55ed04ca7ee2ff7db0c674702ef722.1670594284.git.michal.simek@amd.com