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The DMC-620 memory controllers in N1SDP platform has to be put
into CONFIG state before writing to ERR0CTLR0 register to enable
ECC.

This patch fixes the sequence so that DMCs are set to CONFIG
state before writing to ERR0CTLR0 register and moved back to
READY state after writing.

Change-Id: I1252f3ae0991603bb29234029cddb5fbf869c1b2
Signed-off-by: Manoj Kumar <manoj.kumar3@arm.com>