microblaze: Detect new 7.20.d version

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

arch/microblaze/kernel/cpu/cpuinfo.c

@@ -29,6 +29,7 @@ const struct cpu_ver_key cpu_ver_lookup[] = {
 	{"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},