crypto: qce - Add a QCE IP family compatible 'qcom,qce'

The added 'qcom,qce' compatible value will serve as a sole QCE IP family
compatible, since a particular QCE IP version is discoverablem thus, if
it'd be needed to differentiate various IP versions, it can be obtained
in runtime.

Two IP version based compatibles are left untouched to preserve backward
DTB ABI compatibility.

Signed-off-by: Vladimir Zapolskiy <vladimir.zapolskiy@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>