mmc: core: Fix bustest timeout value

The current code doesn't set any timeout value for bus test commands
CMD19 and CMD14. This fails bus test because the controller returns
DATATIMEOUT error for these commands. Fix the bus test timeout value
to 1ms for all cards.

Change-Id: I12446e094302f51853cc0c56a5c13b4a6a46d8cb
Signed-off-by: Sahitya Tummala <stummala@codeaurora.org>