ARM: dts: imx6ull-colibri: drop incorrect regulator regulator-type

regulator-fixed-clock does not take "regulator-type" property:

  imx6ull-colibri-iris-v2.dtb: regulator-eth-phy: Unevaluated properties are not allowed ('regulator-type' was unexpected)

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>