parisc: Use PARISC_ITLB_TRAP constant in entry.S

Fixes: 5b00ca0b8035 ("parisc: Restore possibility to execute 64-bit applications")
Signed-off-by: Helge Deller <deller@gmx.de>

arch/parisc/kernel/entry.S

@@ -1658,7 +1658,7 @@ dbit_fault:
 
 itlb_fault:
 	b               intr_save
-	ldi             6,%r8
+	ldi             PARISC_ITLB_TRAP,%r8
 
 nadtlb_fault:
 	b               intr_save