stm32mp1: support of STM32MP15x Rev.Z

Add a new revision of STM32MP15x CPU (Rev.Z).

Change-Id: I227dd6d9b3fcc43270015cfb21f60aeb0a8ab658
Signed-off-by: Lionel Debieve <lionel.debieve@st.com>
Signed-off-by: Yann Gautier <yann.gautier@st.com>
2 files changed