openpower/configs: Set default hostname to skiroot

Signed-off-by: Samuel Mendoza-Jonas <sam@mendozajonas.com>
diff --git a/openpower/configs/garrison_defconfig b/openpower/configs/garrison_defconfig
index 9a1c6a8..0239831 100644
--- a/openpower/configs/garrison_defconfig
+++ b/openpower/configs/garrison_defconfig
@@ -30,6 +30,8 @@
 BR2_OPENPOWER_PNOR_FILENAME="garrison.pnor"
 BR2_OPENPOWER_PNOR_UPDATE_FILENAME="garrison_update.pnor"
 
+BR2_TARGET_GENERIC_HOSTNAME="skiroot"
+
 # skiboot requirements
 BR2_PACKAGE_SKIBOOT=y
 BR2_PACKAGE_SKIBOOT_EMBED_PAYLOAD=n