FROMLIST: scsi: ufs: Flush exception event before suspend

Exception event can be raised by the device when system
suspend is in progress. This will result in unclocked
register access in exception event handler as clocks will
be turned off during suspend. This change makes sure to flush
exception event handler work in suspend before disabling
clocks to avoid unclocked register access issue.

Bug: 143632303
Change-Id: Ic01b5e4c7bc95d1ad9fa3c6fb19b848206a13306
Link: https://lore.kernel.org/patchwork/patch/1149888/


Signed-off-by: Sayali Lokhande <sayalil@codeaurora.org>
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
Signed-off-by: Can Guo <cang@codeaurora.org>
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>