selftests/arm64: Clean the fp helper libraries

We provide a couple of object files with helpers linked into several of
the test programs, ensure they are cleaned.
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20220427181954.357975-4-broonie@kernel.orgSigned-off-by: Catalin Marinas <catalin.marinas@arm.com>

tools/testing/selftests/arm64/fp/Makefile

@@ -14,6 +14,8 @@ TEST_GEN_PROGS_EXTENDED := fp-pidbench fpsimd-test \
 	vlset
 TEST_PROGS_EXTENDED := fpsimd-stress sve-stress ssve-stress za-stress
 
+EXTRA_CLEAN += $(OUTPUT)/asm-utils.o $(OUTPUT)/rdvl.o $(OUTPUT)/za-fork-asm.o
+
 # Build with nolibc to avoid effects due to libc's clone() support
 fp-pidbench: fp-pidbench.S asm-utils.o
 	$(CC) -nostdlib $^ -o $@