irqchip/gic-v3: Use nops macro for Cavium ThunderX erratum 23154
The workaround for Cavium ThunderX erratum 23154 has a homebrew pipeflush built out of NOP sequences around the read of the IAR. This patch converts the code to use the new nops macro, which makes it a little easier to read. Reviewed-by: NMark Rutland <mark.rutland@arm.com> Signed-off-by: NWill Deacon <will.deacon@arm.com> Signed-off-by: NMarc Zyngier <marc.zyngier@arm.com>
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