Update HCODE Version in Config.in

The Config.in currently contains a version of HCODE that's too old. This commit updates the version to the latest version of HCODE so that automatic sync can be performed.
diff --git a/openpower/package/hcode-p10/Config.in b/openpower/package/hcode-p10/Config.in
index 2c1d037..006e3e1 100644
--- a/openpower/package/hcode-p10/Config.in
+++ b/openpower/package/hcode-p10/Config.in
@@ -31,7 +31,7 @@
 
 config BR2_HCODE_P10_VERSION
 	string
-	default "hw042221a.opmst10" if BR2_HCODE_P10_LATEST_VERSION
+	default "hw061821a.opmst10" if BR2_HCODE_P10_LATEST_VERSION
 	default BR2_HCODE_P10_CUSTOM_VERSION_VALUE \
 		if BR2_HCODE_P10_CUSTOM_VERSION