fwk_module: Add fwk_module_get_sub_element_count

Merged Darryl Green requested to merge github/fork/nicola-mazzucato-arm/nm/fwk_sub_elem into master

Created by: nicola-mazzucato-arm

Change-Id: I82fabc55fbb5ea68c3bfe25552fa0bab44908652 Signed-off-by: Nicola Mazzucato nicola.mazzucato@arm.com

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