mmc: msm_sdcc: remove MMC_CAP_HW_RESET capability

MMC_CAP_HW_RESET capability was only referring to host driver
capability to toggle eMMC RST_n pin so if the host driver is
unable to toggle this pin, it shouldn't advertise this capability.

CRs-Fixed: 507926
Change-Id: Ia7b1156c6d8e8b49d69033d580e31b972124ae97
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>