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H A Dpsci.S8c0ef7fa Sat Jun 18 23:38:37 CDT 2016 Chen-Yu Tsai <wens@csie.org> ARM: PSCI: Allocate PSCI stack in secure stack section

Now that we have a secure stack section that guarantees usable memory,
allocate the PSCI stacks in that section.

Also add a diagram detailing how the stacks are placed in memory.

Reserved space for the target PC remains unchanged. This should be
moved to global variables within a secure data section in the future.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>