REF:https://bugzilla.tianocore.org/show_bug.cgi?id=3203 The EFIAPI modifier is present in the function definition in FvLib.c but missing in FvLib.h. Causes a GCC build error. Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com> Reviewed-by: Sami Mujawar <sami.mujawar@arm.com>