MLK-10913-1: mxc: sim: Add the SIM driver support for i.MX6UL-EVK platform.

Modify the driver to support the SIM on i.MX6UL-EVK platform. The main modification is:
1. Add port index to support different port on platform.
2. Add POS-CARD support. The POS card has external IC to assert when SVEN to low. Add support.
3. Using a function to calculate the strict timing delay.

Signed-off-by: Luwei Zhou <b45643@freescale.com>
(cherry picked from 17d1315b0704e2db63ee6bd7aaefa0c796f53104)