microblaze: Remove additional compatible properties

Device-tree BSP generates longer compatible properties
that's why we can remove extra/old one.

Signed-off-by: Michal Simek <monstr@monstr.eu>

arch/microblaze/kernel/intc.c

@@ -128,9 +128,6 @@ void __init init_IRQ(void)
 #endif
 	const char * const intc_list[] = {
 				"xlnx,xps-intc-1.00.a",
-				"xlnx,opb-intc-1.00.c",
-				"xlnx,opb-intc-1.00.b",
-				"xlnx,opb-intc-1.00.a",
 				NULL
 			};