programs, tests: Depend only on libmbedcrypto

Update the tests and programs to depend only on libmbedcrypto, since
we'll soon only build libmbedcrypto.
diff --git a/programs/hash/CMakeLists.txt b/programs/hash/CMakeLists.txt
index eda975b..3c6cca9 100644
--- a/programs/hash/CMakeLists.txt
+++ b/programs/hash/CMakeLists.txt
@@ -1,8 +1,8 @@
 add_executable(hello hello.c)
-target_link_libraries(hello mbedtls)
+target_link_libraries(hello mbedcrypto)
 
 add_executable(generic_sum generic_sum.c)
-target_link_libraries(generic_sum mbedtls)
+target_link_libraries(generic_sum mbedcrypto)
 
 install(TARGETS hello generic_sum
         DESTINATION "bin"