configs: Add IFB driver support. 'CONFIG_IFB=m'

IFB driver is needed to do ingress traffic control.
Signed-off-by: NDust Li <dust.li@linux.alibaba-inc.com>

config-4.19.y-x86_64

@@ -1820,7 +1820,7 @@ CONFIG_NET_CORE=y
 CONFIG_DUMMY=m
 # CONFIG_EQUALIZER is not set
 # CONFIG_NET_FC is not set
-# CONFIG_IFB is not set
+CONFIG_IFB=m
 # CONFIG_NET_TEAM is not set
 CONFIG_MACVLAN=y
 CONFIG_MACVTAP=y

config-4.19.y-x86_64-debug

@@ -1819,7 +1819,7 @@ CONFIG_NET_CORE=y
 CONFIG_DUMMY=m
 # CONFIG_EQUALIZER is not set
 # CONFIG_NET_FC is not set
-# CONFIG_IFB is not set
+CONFIG_IFB=m
 # CONFIG_NET_TEAM is not set
 CONFIG_MACVLAN=y
 CONFIG_MACVTAP=y