stm32mp1: get peripheral base address from a define

stm32mp1: get peripheral base address from a define

Retrieve peripheral base address from a define instead of
parsing the device tree. The goal is to improve execution time.

Signed-off-by: Pascal Paillet <p.paillet@st.com>
Signed-off-by: Yann Gautier <yann.gautier@st.com>
Change-Id: I2588c53ad3d4abcc3d7fe156458434a7940dd72b