UPSTREAM: arm64: add Cortex-A57 erratum 832075 workaround

The ARM erratum 832075 applies to certain revisions of Cortex-A57,
one of the workarounds is to change device loads into using
load-aquire semantics.
This is achieved using the alternatives framework.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

Bug: 31432001
Change-Id: I21e88a339dca8cada2c0b5f71ab0e52141b1ce39
(cherry picked from commit 5afaa1fc1b320cec48affa7e6949f2493f875c12)
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>