crypto: powerpc/chacha20,poly1305-p10 - Add dependency on VSX

Add dependency on VSX as otherwise the build will fail without
it.

Fixes: 161fca7e ("crypto: powerpc - Add chacha20/poly1305-p10 to Kconfig and Makefile")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202308251906.SYawej6g-lkp@intel.com/Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

arch/powerpc/crypto/Kconfig

@@ -113,7 +113,7 @@ config CRYPTO_AES_GCM_P10
 
 config CRYPTO_CHACHA20_P10
 	tristate "Ciphers: ChaCha20, XChacha20, XChacha12 (P10 or later)"
-	depends on PPC64 && CPU_LITTLE_ENDIAN
+	depends on PPC64 && CPU_LITTLE_ENDIAN && VSX
 	select CRYPTO_SKCIPHER
 	select CRYPTO_LIB_CHACHA_GENERIC
 	select CRYPTO_ARCH_HAVE_LIB_CHACHA
@@ -127,7 +127,7 @@ config CRYPTO_CHACHA20_P10
 
 config CRYPTO_POLY1305_P10
 	tristate "Hash functions: Poly1305 (P10 or later)"
-	depends on PPC64 && CPU_LITTLE_ENDIAN
+	depends on PPC64 && CPU_LITTLE_ENDIAN && VSX
 	select CRYPTO_HASH
 	select CRYPTO_LIB_POLY1305_GENERIC
 	help