mmc: core: Add runtime PM calls for debugfs/sysfs entries

Few debugfs/sysfs entries may require access to host and card.
Currently, read/write to these entries are not updated with
mmc_rpm_hold and mmc_rpm_release APIs due to which the device
is not getting resumed if it is already runtime suspended.
Fix this by calling those APIs at relevant code paths.

CRs-fixed: 482172
Change-Id: I937694650b9e6097a28785e529d2952cff89c7de
Signed-off-by: Sahitya Tummala <stummala@codeaurora.org>