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Rule 8.4: A compatible declaration shall be visible when
an object or function with external linkage is defined

Fixed for:
	make DEBUG=1 PLAT=juno SPD=tspd CSS_USE_SCMI_SDS_DRIVER=1 all

Change-Id: Id732c8df12ef3e20903c41b7ab9a9b55341d68ac
Signed-off-by: Roberto Vargas <roberto.vargas@arm.com>