crypto: vmx - Fix build error

When I refactored this Makefile, I accidentally changed the CONFIG
option.

Fixes: b52455a73d ("crypto: vmx - Align the short log with Makefile cleanups")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/vmx/Makefile

@@ -3,7 +3,7 @@ obj-$(CONFIG_CRYPTO_DEV_VMX_ENCRYPT) += vmx-crypto.o
 vmx-crypto-objs := vmx.o aesp8-ppc.o ghashp8-ppc.o aes.o aes_cbc.o aes_ctr.o aes_xts.o ghash.o
 
 quiet_cmd_perl = PERL    $@
-      cmd_perl = $(PERL) $< $(if $(CONFIG_LITTLE_ENDIAN), linux-ppc64le, linux-ppc64) > $@
+      cmd_perl = $(PERL) $< $(if $(CONFIG_CPU_LITTLE_ENDIAN), linux-ppc64le, linux-ppc64) > $@
 
 targets += aesp8-ppc.S ghashp8-ppc.S