mmc: core: Fix mmc sleep/awake functionality

Currently as part of mmc suspend and resume, we are using
different api's to check support for cmd5 (sleep/awake),
which results in suspend sending cmd5 for sleep, while
in resume it's always going for full init instead of sending
cmd5 for awake. Fix this by using same api in both suspend
and resume paths so that partial init functionality is
actually utilized.

Change-Id: Ia84b7790fe00f1f24a63d6dc509646ebcbd4d3ef
Signed-off-by: Sayali Lokhande <sayalil@codeaurora.org>