crypto: engine - move crypto engine to its own header

This patch move the whole crypto engine API to its own header
crypto/engine.h.

Signed-off-by: Corentin Labbe <clabbe.montjoie@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/omap-aes.c

@@ -36,6 +36,7 @@
 #include <crypto/scatterwalk.h>
 #include <crypto/aes.h>
 #include <crypto/algapi.h>
+#include <crypto/engine.h>
 
 #define DST_MAXBURST			4
 #define DMA_MIN				(DST_MAXBURST * sizeof(u32))

drivers/crypto/omap-des.c

@@ -39,6 +39,7 @@
 #include <crypto/scatterwalk.h>
 #include <crypto/des.h>
 #include <crypto/algapi.h>
+#include <crypto/engine.h>
 
 #define DST_MAXBURST			2