clk: stm32f7: get RCC base address from DT

Retrieve RCC base address from DT, this will prepare
the ground for future STM32 SoCs support.

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