Fix up refmodel generate unit_tests

Due to various code changes:
* Update dot product values after "Update reference generator
test set calculation"
* Update FP special values after "Add FP Special FP32 UNARY tests"

Signed-off-by: Jeremy Johnson <jeremy.johnson@arm.com>
Change-Id: I48e7e3909794ec62530efd8a6d07f766154f33c8