staging: rtl8192u: ieee80211: ieee80211_softmac: Replace driver specific macro...

staging: rtl8192u: ieee80211: ieee80211_softmac: Replace driver specific macro msleep_interruptible_rsl

Replace driver specific msleep_interruptible_rsl macro with direct
call to msleep_interruptible.

Signed-off-by: Amitoj Kaur Chawla <amitoj1606@gmail.com>
Reviewed-by: Vaishali Thakkar <vaishali.thakkar@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>