crypto: caam - fix RNG deinstantiation error checking

RNG instantiation was previously fixed by
commit 62743a41 ("crypto: caam - fix RNG init descriptor ret. code checking")
while deinstantiation was not addressed.

Since the descriptors used are similar, in the sense that they both end
with a JUMP HALT command, checking for errors should be similar too,
i.e. status code 7000_0000h should be considered successful.

Cc: <stable@vger.kernel.org> # 3.13+
Fixes: 1005bccd ("crypto: caam - enable instantiation of all RNG4 state handles")
Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>