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This patch applies the new MSR instruction to directly set the
PSTATE.SSBS bit which controls speculative loads. This new instruction
is available at Neoverse N1 core so it's utilised.

Change-Id: Iee18a8b042c90fdb72d2b98f364dcfbb17510728
Signed-off-by: John Tsichritzis <john.tsichritzis@arm.com>