powerpc/microwatt: Correct ISA version number in device tree

The kernel uses 3100 to indicate ISA version 3.1, not 3010, so
fix the Microwatt device tree to use 3100.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/aB6taMDWvJwOl9xj@bruin

Author: paulusmack

arch/powerpc/boot/dts/microwatt.dts

@@ -37,7 +37,7 @@
 
 		ibm,powerpc-cpu-features {
 			display-name = "Microwatt";
-			isa = <3010>;
+			isa = <3100>;
 			device_type = "cpu-features";
 			compatible = "ibm,powerpc-cpu-features";