dt-bindings: clock: drop unneeded quotes and use absolute /schemas path

Cleanup bindings dropping unneeded quotes. Once all these are fixed,
checking for this can be enabled in yamllint.  Also absolute path
starting with /schemas is preferred.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230609140751.65129-1-krzysztof.kozlowski@linaro.org


Signed-off-by: Stephen Boyd <sboyd@kernel.org>