clk: stm32f7: add static for configure_clocks()

Also remove its declaration from stm32.h which
is no more needed.

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

arch/arm/include/asm/arch-stm32f7/stm32.h

@@ -114,7 +114,6 @@ struct stm32_pwr_regs {
 };
 #define STM32_PWR		((struct stm32_pwr_regs *)PWR_BASE)
 
-int configure_clocks(void);
 unsigned long clock_get(enum clock clck);
 void stm32_flash_latency_cfg(int latency);