x86: tangier: acpi: Add GPIO card detection to SDHCI #2

On Intel Tangier the SDHCI #2 provides SD card connection.
Add GPIO card detection for it.

Fixes: 39665bee ("x86: tangier: Enable ACPI support for Intel Tangier")
BugLink: https://github.com/edison-fw/meta-intel-edison/issues/135


Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Bin Meng <bmeng.cn@gmail.com>