Fix additional misspellings found by codespell

Remaining hits seem to be hex data, certificates,
and other miscellaneous exceptions.
List generated by running codespell -w -L 
keypair,Keypair,KeyPair,keyPair,ciph,nd

Signed-off-by: Andrzej Kurek <andrzej.kurek@arm.com>
diff --git a/tests/suites/test_suite_pk.function b/tests/suites/test_suite_pk.function
index 91fbb2c..7587d6c 100644
--- a/tests/suites/test_suite_pk.function
+++ b/tests/suites/test_suite_pk.function
@@ -168,12 +168,12 @@
 
     if( key_is_rsa )
     {
-        bitlen = 1024; /* harcoded in genkey() */
+        bitlen = 1024; /* hardcoded in genkey() */
         key = pk_psa_genkey_rsa();
     }
     else
     {
-        bitlen = 256; /* harcoded in genkey() */
+        bitlen = 256; /* hardcoded in genkey() */
         key = pk_psa_genkey_ecc();
     }
     if( mbedtls_svc_key_id_is_null( key ) )