mmc: bus: Handle error in case bus_ops suspend fails

bus_ops->suspend may fail due to some reason
(for e.g. due to flush timeout). In such cases,
if we return error to PM framework from here without
calling pm_generic_resume then mmc request may get stuck
since PM framework will assume that mmc bus not suspended
(because of error) and it won't call resume again.

Thus fix this by calling pm_generic_resume in case of error
from bus_ops->suspend in mmc_bus_suspend.

Change-Id: Iaef485d0b47b005aa88e61cd77a2b7b65931def1
Signed-off-by: Ritesh Harjani <riteshh@codeaurora.org>
Signed-off-by: Sayali Lokhande <sayalil@codeaurora.org>
Signed-off-by: Siba Prasad <sibap@codeaurora.org>