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Now that we have a secure data section and space to store per-CPU target PC address, switch to it instead of storing the target PC on the stack. Also save clobbered r4-r7 registers on the stack and restore them on return in psci_cpu_on for Tegra, i.MX7, and LS102xA platforms. Signed-off-by: Chen-Yu Tsai <wens@csie.org> Signed-off-by: Hans de Goede <hdegoede@redhat.com>