msm: sdio: fix modem reset and card removal race condition

In cases where the modem HW watchdog causes a modem reset
we can get a card removal event in the middle of modem
reset event.

Change-Id: Ieef2f463f916054b16c8c0d02bf5cf775852ac06
Signed-off-by: Maya Erez <merez@codeaurora.org>