Add support for selecting encryption backend

- Add two new module parameters to icp (icp_aes_impl, icp_gcm_impl)
  that control the crypto implementation.  At the moment there is a
  choice between generic and aesni (on platforms that support it).
- This enables support for AES-NI and PCLMULQDQ-NI on AMD Family
  15h (bulldozer) and newer CPUs (zen).
- Modify aes_key_t to track what implementation it was generated
  with as key schedules generated with various implementations
  are not necessarily interchangable.

Reviewed by: Gvozden Neskovic <neskovic@gmail.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Tom Caputi <tcaputi@datto.com>
Reviewed-by: Richard Laager <rlaager@wiktel.com>
Signed-off-by: Nathaniel R. Lewis <linux.robotdude@gmail.com>
Closes #7102 
Closes #7103

lib/libicp/Makefile.am

@@ -18,8 +18,8 @@ if TARGET_ASM_X86_64
 ASM_SOURCES_C = asm-x86_64/aes/aeskey.c
 ASM_SOURCES_AS = \
 	asm-x86_64/aes/aes_amd64.S \
-	asm-x86_64/aes/aes_intel.S \
-	asm-x86_64/modes/gcm_intel.S \
+	asm-x86_64/aes/aes_aesni.S \
+	asm-x86_64/modes/gcm_pclmulqdq.S \
 	asm-x86_64/sha1/sha1-x86_64.S \
 	asm-x86_64/sha2/sha256_impl.S \
 	asm-x86_64/sha2/sha512_impl.S
@@ -46,11 +46,16 @@ KERNEL_C = \
 	api/kcf_cipher.c \
 	api/kcf_miscapi.c \
 	api/kcf_mac.c \
+	algs/aes/aes_impl_aesni.c \
+	algs/aes/aes_impl_generic.c \
+	algs/aes/aes_impl_x86-64.c \
 	algs/aes/aes_impl.c \
 	algs/aes/aes_modes.c \
 	algs/edonr/edonr.c \
 	algs/modes/modes.c \
 	algs/modes/cbc.c \
+	algs/modes/gcm_generic.c \
+	algs/modes/gcm_pclmulqdq.c \
 	algs/modes/gcm.c \
 	algs/modes/ctr.c \
 	algs/modes/ccm.c \