Arm backend: Added 16x8 tests for VGF #2185

Job	Run time
test-arm / test-backend-linux (arm_tosa_fp, operators) / linux-job	18m 34s
test-arm / test-backend-linux (arm_tosa_fp, models) / linux-job	27m 53s
test-arm / test-backend-linux (arm_vgf_fp, operators) / linux-job	16m 59s
test-arm / test-backend-linux (arm_vgf_fp, models) / linux-job	26m 15s
test-arm / test-backend-macos	-1s
test-arm / package-golden-artifacts	44s
	1h 30m 24s

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