Airkiss: add aes-cbc-128 decryption

[bigfeng12]

Use AES-CBC mode for decryption after hack of wechat official AES lib, and the AES-key and IV is the same verfied and confirmed by test vector:

    struct cbc_test {
            u8 key[16];
            u8 iv[16];
            u8 plain[32];
            u8 cipher[32];
            size_t len;
    } cbc = {
            {
                    0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38,
                    0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38
            },
            {
                    0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38,
                    0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38
            },
            {
                    0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38,
                    0x38, 0x37, 0x36, 0x35, 0x34, 0x33, 0x31, 0x01
            },
            {
                    0xb7, 0xfc, 0x2b, 0x0e, 0xa4, 0x78, 0x01, 0xd2,
                    0x4a, 0x1f, 0x04, 0x9e, 0xb2, 0x9c, 0xbe, 0x84
            },

            16
    };

Signed-off-by: Peiyong Feng [email protected]