Revert "blockconsole: Fix undefined MAX_RT_PRIO"

This reverts commit d48705fddc24a995cc5be26c1ceee87c1f563f5b.

Patch was needed for -next, but breaks compilation in this tree.
diff --git a/drivers/block/blockconsole.c b/drivers/block/blockconsole.c
index 68c571a..980358c 100644
--- a/drivers/block/blockconsole.c
+++ b/drivers/block/blockconsole.c
@@ -18,7 +18,6 @@
 #include <linux/string.h>
 #include <linux/workqueue.h>
 #include <linux/sched.h>
-#include <linux/sched/rt.h>
 #include <linux/ctype.h>
 
 #define BLOCKCONSOLE_MAGIC	"\nLinux blockconsole version 1.1\n"