mmc: sdhci: Enable MMC_CAP_HW_RESET capability

Enable MMC_CAP_HW_RESET capability so that MMC block layer
can reset the hardware during error recovery scenarios.

Change-Id: I6100a3c6c34ee4c965595e422f793b195a758a46
Signed-off-by: Sahitya Tummala <stummala@codeaurora.org>