meta-lenovo: hr855xg2: add kernel configurations

Add kernel configurations.

Tested:
Build Lenovo hr855xg2 image and load on the target hardware,
make sure BMC could boot to console.

Signed-off-by: Lisa Liu <liuyj19@lenovo.com>
Change-Id: I2ce347ac5c0df1d7249792b5a97e1c31845aecd7
diff --git a/meta-hr855xg2/recipes-kernel/linux/linux-aspeed_%.bbappend b/meta-hr855xg2/recipes-kernel/linux/linux-aspeed_%.bbappend
new file mode 100644
index 0000000..330800a
--- /dev/null
+++ b/meta-hr855xg2/recipes-kernel/linux/linux-aspeed_%.bbappend
@@ -0,0 +1,5 @@
+#"Copyright (c) 2019-present Lenovo
+#Licensed under BSD-3, see COPYING.BSD file for details."
+
+FILESEXTRAPATHS_prepend_hr855xg2 := "${THISDIR}/${PN}:"
+SRC_URI_append_hr855xg2 = " file://hr855xg2.cfg"