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Cortex-A725 erratum 3456106 is a Cat B erratum that applies
to revisions r0p0, r0p1 and r0p2, it is still open.
This erratum can be avoided by having Speculation Barrier (SB)
instruction after the writes to the PSTATE.SSBS.
SDEN documentation:
https://developer.arm.com/documentation/SDEN-2832921/latest/
Change-Id: I10d1e8cb4da19ba4101a5617245ff75866707d25
Signed-off-by: Xialin Liu <xialin.liu@arm.com>
(cherry picked from commit 403ca6da52)