crypto: ppc/curve25519 - Update Kconfig and Makefile for ppc64le

Defined CRYPTO_CURVE25519_PPC64 to support X25519 for ppc64le.

Added new module curve25519-ppc64le for X25519.
Signed-off-by: Danny Tsen <dtsen@linux.ibm.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

arch/powerpc/crypto/Kconfig

@@ -2,6 +2,17 @@
 
 menu "Accelerated Cryptographic Algorithms for CPU (powerpc)"
 
+config CRYPTO_CURVE25519_PPC64
+	tristate "Public key crypto: Curve25519 (PowerPC64)"
+	depends on PPC64 && CPU_LITTLE_ENDIAN
+	select CRYPTO_LIB_CURVE25519_GENERIC
+	select CRYPTO_ARCH_HAVE_LIB_CURVE25519
+	help
+	  Curve25519 algorithm
+
+	  Architecture: PowerPC64
+	  - Little-endian
+
 config CRYPTO_CRC32C_VPMSUM
 	tristate "CRC32c"
 	depends on PPC64 && ALTIVEC

arch/powerpc/crypto/Makefile

@@ -17,6 +17,7 @@ obj-$(CONFIG_CRYPTO_AES_GCM_P10) += aes-gcm-p10-crypto.o
 obj-$(CONFIG_CRYPTO_CHACHA20_P10) += chacha-p10-crypto.o
 obj-$(CONFIG_CRYPTO_POLY1305_P10) += poly1305-p10-crypto.o
 obj-$(CONFIG_CRYPTO_DEV_VMX_ENCRYPT) += vmx-crypto.o
+obj-$(CONFIG_CRYPTO_CURVE25519_PPC64) += curve25519-ppc64le.o
 
 aes-ppc-spe-y := aes-spe-core.o aes-spe-keys.o aes-tab-4k.o aes-spe-modes.o aes-spe-glue.o
 md5-ppc-y := md5-asm.o md5-glue.o
@@ -29,6 +30,7 @@ aes-gcm-p10-crypto-y := aes-gcm-p10-glue.o aes-gcm-p10.o ghashp10-ppc.o aesp10-p
 chacha-p10-crypto-y := chacha-p10-glue.o chacha-p10le-8x.o
 poly1305-p10-crypto-y := poly1305-p10-glue.o poly1305-p10le_64.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
+curve25519-ppc64le-y := curve25519-ppc64le-core.o curve25519-ppc64le_asm.o
 
 ifeq ($(CONFIG_CPU_LITTLE_ENDIAN),y)
 override flavour := linux-ppc64le