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This patch adds support for SP_MIN on JUNO platform.
The changes include addition of AArch32 assembly files,
JUNO specific SP_MIN make file and miscellaneous changes
in ARM platform files to enable support for SP_MIN.

Change-Id: Id1303f422fc9b98b9362c757b1a4225a16fffc0b
Signed-off-by: Yatharth Kochar <yatharth.kochar@arm.com>
Signed-off-by: dp-arm <dimitris.papastamos@arm.com>