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Cortex-A57 erratum #806969 applies to revision r0p0 of the CPU
but does not manifest itself on Juno r0. It is not applicable
to Juno r1 in any case.

This patch modifies the Juno platform Makefile to no longer
compile this erratum workaround in.

Change-Id: I32b16835b2ac897e639e869ab2b78b62a51a0139