meta-quanta: gbs: add gbmc distro override

1. add gbmc distro override
2. add GBMC_NCSI_IF_NAME to enable gbmc-ncsi-config
3. enable kernel netfilter configurations to be compatible
   with gbmc network config rules

Signed-off-by: George Hung <george.hung@quantatw.com>
Change-Id: I5b36f79d4a6dcb31753deb860d2e0c7f3349efbd
diff --git a/meta-quanta/meta-gbs/conf/local.conf.sample b/meta-quanta/meta-gbs/conf/local.conf.sample
index 02e7869..787ab30 100644
--- a/meta-quanta/meta-gbs/conf/local.conf.sample
+++ b/meta-quanta/meta-gbs/conf/local.conf.sample
@@ -1,5 +1,5 @@
 MACHINE ??= "gbs"
-DISTRO ?= "openbmc-phosphor"
+DISTRO ?= "gbmc"
 PACKAGE_CLASSES ?= "package_rpm"
 SANITY_TESTED_DISTROS_append ?= " *"
 EXTRA_IMAGE_FEATURES = "debug-tweaks"