crypto: caam - fix gfp allocation flags (part I)

Changes in the SW cts (ciphertext stealing) code in
commit 0605c41cc53ca ("crypto: cts - Convert to skcipher")
revealed a problem in the CAAM driver:
when cts(cbc(aes)) is executed and cts runs in SW,
cbc(aes) is offloaded in CAAM; cts encrypts the last block
in atomic context and CAAM incorrectly decides to use GFP_KERNEL
for memory allocation.

Fix this by allowing GFP_KERNEL (sleeping) only when MAY_SLEEP flag is
set, i.e. remove MAY_BACKLOG flag.

We split the fix in two parts - first is sent to -stable, while the
second is not (since there is no known failure case).

Link: http://lkml.kernel.org/g/[email protected]
Cc: <[email protected]> # 4.8+
Reported-by: David Gstir <[email protected]>
Signed-off-by: Horia Geantă <[email protected]>
Signed-off-by: Herbert Xu <[email protected]>

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