This patch is a CE-optimized assembly implementation for cmac/xcbc/cbcmac.

Benchmark on T-Head Yitian-710 2.75 GHz, the data comes from the 300 mode of
tcrypt, and compared the performance before and after this patch (the driver
used before this patch is XXXmac(sm4-ce)). The abscissas are blocks of
different lengths. The data is tabulated and the unit is Mb/s:

Before:

update-size    |      16      64     256    1024    2048    4096    8192
---------------+--------------------------------------------------------
cmac(sm4-ce)   |  293.33  403.69  503.76  527.78  531.10  535.46  535.81
xcbc(sm4-ce)   |  292.83  402.50  504.02  529.08  529.87  536.55  538.24
cbcmac(sm4-ce) |  318.42  415.79  497.12  515.05  523.15  521.19  523.01

After:

update-size    |      16      64     256    1024    2048    4096    8192
---------------+--------------------------------------------------------
cmac-sm4-ce    |  371.99  675.28  903.56  971.65  980.57  990.40  991.04
xcbc-sm4-ce    |  372.11  674.55  903.47  971.61  980.96  990.42  991.10
cbcmac-sm4-ce  |  371.63  675.33  903.23  972.07  981.42  990.93  991.45
Signed-off-by: Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>