crypto/fsl: fix BLOB encapsulation and decapsulation

The blob_encap and blob_decap functions were not flushing the dcache
before passing data to CAAM/DMA and not invalidating the dcache when
getting data back.
Therefore, blob encapsulation and decapsulation failed with errors like
the following due to data cache incoherency:
"40000006: DECO: desc idx 0: Invalid KEY command"

To ensure coherency, we require the key_mod, src and dst buffers to be
aligned to the cache line size and flush/invalidate the memory regions.
The same requirements apply to the job descriptor.

Tested on an i.MX6Q board.

Reviewed-by: Sumit Garg <sumit.garg@nxp.com>
Signed-off-by: Clemens Gruber <clemens.gruber@pqgruber.com>

include/fsl_sec.h

@@ -215,6 +215,8 @@ struct sg_entry {
 #define SG_ENTRY_OFFSET_SHIFT	0
 };
 
+#define BLOB_SIZE(x)		((x) + 32 + 16) /* Blob buffer size */
+
 #if defined(CONFIG_MX6) || defined(CONFIG_MX7)
 /* Job Ring Base Address */
 #define JR_BASE_ADDR(x) (CONFIG_SYS_FSL_SEC_ADDR + 0x1000 * (x + 1))
@@ -274,8 +276,6 @@ struct sg_entry {
 #define PERM			0x0000B008      /* Clear on release, lock SMAP
 						 * lock SMAG group 1 Blob */
 
-#define BLOB_SIZE(x)       (x + 32 + 16) /* Blob buffer size */
-
 /* HAB WRAPPED KEY header */
 #define WRP_HDR_SIZE		0x08
 #define HDR_TAG			0x81