Add config option for AES encryption only

-Add config option for AES encyption only to config.h. Feature is
 disabled by default.
-Enable AES encrypt only feature in baremetal.h configuration
-Remove AES encypt only feature from full config

scripts/config.pl

@@ -52,6 +52,7 @@
 #   MBEDTLS_NO_UDBL_DIVISION
 #   MBEDTLS_NO_64BIT_MULTIPLICATION
 #   MBEDTLS_AES_ONLY_128_BIT_KEY_LENGTH
+#   MBEDTLS_AES_ONLY_ENCRYPT
 #   and any symbol beginning _ALT
 #
 
@@ -128,6 +129,7 @@ MBEDTLS_NO_UDBL_DIVISION
 MBEDTLS_NO_64BIT_MULTIPLICATION
 MBEDTLS_USE_TINYCRYPT
 MBEDTLS_AES_ONLY_128_BIT_KEY_LENGTH
+MBEDTLS_AES_ONLY_ENCRYPT
 _ALT\s*$
 );