arm64: dts: qcom: sda660-ifc6560: Fix dt-validate warning

arm64: dts: qcom: sda660-ifc6560: Fix dt-validate warning

If you remove clocks property, you should remove clock-names, too.
Fixes warning with dtbs check:

 'clocks' is a dependency of 'clock-names'

Fixes: 34279d6e3f32c ("arm64: dts: qcom: sdm660: Add initial Inforce IFC6560 board support")
Signed-off-by: Alexey Minnekhanov <alexeymin@postmarketos.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20250504115120.1432282-4-alexeymin@postmarketos.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>