ARM: STi: DT: STiH416: Remove unused CLK_S_GMAC0_PHY & CLK_S_ETH1_PHY fixed clocks

CLK_S_GMAC0_PHY &  CLK_S_ETH1_PH clocks are no longer used.

Signed-off-by: Gabriel Fernandez <gabriel.fernandez@linaro.org>
Signed-off-by: Maxime Coquelin <maxime.coquelin@st.com>