Start adding internal module block_cipher.c

Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
diff --git a/library/Makefile b/library/Makefile
index 9e2d723..d11a98d 100644
--- a/library/Makefile
+++ b/library/Makefile
@@ -91,6 +91,7 @@
 	     bignum_core.o \
 	     bignum_mod.o \
 	     bignum_mod_raw.o \
+	     block_cipher.o \
 	     camellia.o \
 	     ccm.o \
 	     chacha20.o \