staging: rtl8821ae: Fix indetentation of switch case statements

Fixes checkpatch error:

ERROR: switch and case should be at the same indent
+               switch (coex_dm->cur_retrylimit_type) {
+                       case 0: /* normal mode */
[...]
+                       case 1: /* retry limit=8 */
[...]
+                       default:

Signed-off-by: Mark Einon <mark@einon.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>