clk: clk_stm32f: Remove STMMAC clock setup

Thanks to 'commit ba1f966725 ("net: designware: add clock support")'
we don't need anymore to setup the STMMAC clock in board.

Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Reviewed-by: Vikas Manocha <vikas.manocha@st.com>

arch/arm/include/asm/arch-stm32f7/stm32_periph.h

@@ -23,7 +23,6 @@ enum periph_id {
 enum periph_clock {
 	SYSCFG_CLOCK_CFG,
 	TIMER2_CLOCK_CFG,
-	STMMAC_CLOCK_CFG,
 };
 
 #endif /* __ASM_ARM_ARCH_PERIPH_H */