lib/crypto: powerpc: Add powerpc/aesp8-ppc.S to clean-files

Make the generated file powerpc/aesp8-ppc.S be removed by 'make clean'.

Fixes: 7cf2082 ("lib/crypto: powerpc/aes: Migrate POWER8 optimized code into library")
Acked-by: Ard Biesheuvel <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Eric Biggers <[email protected]>

Author: Eric Biggers

lib/crypto/Makefile

@@ -55,6 +55,9 @@ libaes-$(CONFIG_SPARC) += sparc/aes_asm.o
 libaes-$(CONFIG_X86) += x86/aes-aesni.o
 endif # CONFIG_CRYPTO_LIB_AES_ARCH
 
+# clean-files must be defined unconditionally
+clean-files += powerpc/aesp8-ppc.S
+
 ################################################################################
 
 obj-$(CONFIG_CRYPTO_LIB_AESCFB)			+= libaescfb.o