rtsx: Fix wakeup race similar to sdhci one fixed in 35547df5c786

rtsx copied code from sdhci, and has the same wakeup race bug that was
fixed in 35547df5c786, so apply a similar fix here.

Sponsored by: Netflix

(cherry picked from commit 9339e7c0bd565506092bb0a2618ff32fb04bb2c4)