ARM: stm32: add AMBA support for stm32 family

This patch enables AMBA support for stm32 family.
stm32 family embeds different amba pl180 variants.

Signed-off-by: Ludovic Barre <ludovic.barre@st.com>
Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>
Signed-off-by: Olof Johansson <olof@lixom.net>