ArmPkg: Fix Ecc error 10014 in ArmScmiDxe

ArmPkg: Fix Ecc error 10014 in ArmScmiDxe

This patch fixes the following Ecc reported error:
No used module files found

The source files
[ArmPkg/Drivers/ArmScmiDxe/ArmScmiPerformanceProtocolPrivate.h]
[ArmPkg/Drivers/ArmScmiDxe/ScmiPrivate.h]
[ArmPkg/Drivers/ArmScmiDxe/ScmiDxe.h]
[ArmPkg/Drivers/ArmScmiDxe/ArmScmiBaseProtocolPrivate.h]
[ArmPkg/Drivers/ArmScmiDxe/ArmScmiClockProtocolPrivate.h]
are existing in module
ArmPkg/Drivers/ArmScmiDxe/ArmScmiDxe.inf
but are not described in INF the file.

The patch also re-orders the files in the
[Sources.common] section.

Signed-off-by: Pierre Gondois <Pierre.Gondois@arm.com>
Reviewed-by: Sami Mujawar <sami.mujawar@arm.com>