arm64: dts: Add timer erratum property for LS2080A and LS1043A

Both the LS1043A and LS2080A platforms are affected by the Freescale
A008585 erratum. Advertise it in their respective device trees.

Signed-off-by: Scott Wood <oss@buserror.net>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>