fwk: Replace remaining `assert()` call with `fwk_assert()`

Merged Darryl Green requested to merge github/fork/nicola-mazzucato-arm/fwk_assert_sept_21 into master

Created by: nicola-mazzucato-arm

A previous commit (7b01ad84) left behind one replacement from assert() to fwk_assert().

This commit fixes that.

Change-Id: Id98d2d09bb25d2842beeff69b7938fe259d5938c Signed-off-by: Nicola Mazzucato nicola.mazzucato@arm.com

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