microblaze: Detect new 7.20.d version

Signed-off-by: Michal Simek <monstr@monstr.eu>
diff --git a/arch/microblaze/kernel/cpu/cpuinfo.c b/arch/microblaze/kernel/cpu/cpuinfo.c
index 3539babc..a9aa5cf 100644
--- a/arch/microblaze/kernel/cpu/cpuinfo.c
+++ b/arch/microblaze/kernel/cpu/cpuinfo.c
@@ -29,6 +29,7 @@
 	{"7.20.a", 0x0c},
 	{"7.20.b", 0x0d},
 	{"7.20.c", 0x0e},
+	{"7.20.d", 0x0f},
 	/* FIXME There is no keycode defined in MBV for these versions */
 	{"2.10.a", 0x10},
 	{"3.00.a", 0x20},