Add example program for PSA hash

This commit adds the example program for PSA
hash as well as the relevant changes to
CMakeLists.txt and the Makefile.

Signed-off-by: Thomas Daubney <thomas.daubney@arm.com>
diff --git a/programs/psa/CMakeLists.txt b/programs/psa/CMakeLists.txt
index 7ba4af6..c8ee626 100644
--- a/programs/psa/CMakeLists.txt
+++ b/programs/psa/CMakeLists.txt
@@ -4,6 +4,7 @@
     hmac_demo
     key_ladder_demo
     psa_constant_names
+    psa_hash
 )
 
 if(GEN_FILES)