mmc: sdhci-msm: 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: Ia1408d95503d19ae0f7c49c7bb7905b0ddaddbd5
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>