mmc: dw_mmc-k3: add sd support for hi3660

Add sd card support for hi3660 soc

Signed-off-by: Li Wei <liwei213@huawei.com>
Signed-off-by: Chen Jun <chenjun14@huawei.com>
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
