TAMP backup registers will be exposed as nvmem cells.
Each registers ([0..127] for STM32MP2, [0..31] for STM32MP1) could be
exposed as nvmem cells under the nvram node in device tree
Signed-off-by: Simeon Marijon <simeon.marijon@foss.st.com>
Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>