ARM: stm32: Add AMBA support for STM32F4 and STM32F7 SoCs
As both STM32F4 and STM32F7 SoCs embeds an AMBA PL180 mmci IP,
we need to enable AMBA support in mach-stm32.
Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>