skiboot: Update to v6.8-104-g820d43c0a

Initial P10 support.

Signed-off-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com>
diff --git a/openpower/package/skiboot/Config.in b/openpower/package/skiboot/Config.in
index 4226659..bdd5817 100644
--- a/openpower/package/skiboot/Config.in
+++ b/openpower/package/skiboot/Config.in
@@ -31,7 +31,7 @@
 
 config BR2_SKIBOOT_VERSION
 	string
-	default "v6.6-85-gabe4c4799" if BR2_SKIBOOT_LATEST_VERSION
+	default "v6.8-104-g820d43c0a" if BR2_SKIBOOT_LATEST_VERSION
 	default BR2_SKIBOOT_CUSTOM_VERSION_VALUE \
 		if BR2_SKIBOOT_CUSTOM_VERSION