ARM: 7442/1: Revert "remove unused restart trampoline"
This reverts commit fa18484d. We need the restart trampoline back so that we can revert a related problematic patch 6b5c8045 ("arm: new way of handling ERESTART_RESTARTBLOCK"). Acked-by: NCatalin Marinas <catalin.marinas@arm.com> Signed-off-by: NWill Deacon <will.deacon@arm.com> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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