hash: Allow for SHA512 hardware implementations

Similar to support for SHA1 and SHA256, allow the use of hardware hashing
engine by enabling the algorithm and setting  CONFIG_SHA_HW_ACCEL /
CONFIG_SHA_PROG_HW_ACCEL.

Signed-off-by: Joel Stanley <joel@jms.id.au>
diff --git a/lib/Kconfig b/lib/Kconfig
index 80ff244..ab8c9cc 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -391,19 +391,18 @@
 config SHA_HW_ACCEL
 	bool "Enable hashing using hardware"
 	help
-	  This option enables hardware acceleration
-	  for SHA1/SHA256 hashing.
-	  This affects the 'hash' command and also the
-	  hash_lookup_algo() function.
+	  This option enables hardware acceleration for SHA hashing.
+	  This affects the 'hash' command and also the hash_lookup_algo()
+	  function.
 
 config SHA_PROG_HW_ACCEL
 	bool "Enable Progressive hashing support using hardware"
 	depends on SHA_HW_ACCEL
 	help
-	  This option enables hardware-acceleration for
-	  SHA1/SHA256 progressive hashing.
-	  Data can be streamed in a block at a time and the hashing
-	  is performed in hardware.
+	  This option enables hardware-acceleration for SHA progressive
+	  hashing.
+	  Data can be streamed in a block at a time and the hashing is
+	  performed in hardware.
 
 config MD5
 	bool "Support MD5 algorithm"