meta-phosphor: phosphor-ipmi-flash: add net bridge option

Add a new PACKAGECONFIG option for enabling the network bridge data
transfer backend.

(From meta-phosphor rev: 23bb90e4e655008366d4aeb9918743de143b2457)

Change-Id: I1ea955129e757431cd1aea059a25dfd0d051477c
Signed-off-by: Benjamin Fair <benjaminfair@google.com>
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/meta-phosphor/recipes-phosphor/ipmi/phosphor-ipmi-flash_git.bb b/meta-phosphor/recipes-phosphor/ipmi/phosphor-ipmi-flash_git.bb
index 3c11d85..534e4ec 100644
--- a/meta-phosphor/recipes-phosphor/ipmi/phosphor-ipmi-flash_git.bb
+++ b/meta-phosphor/recipes-phosphor/ipmi/phosphor-ipmi-flash_git.bb
@@ -35,6 +35,7 @@
 PACKAGECONFIG[aspeed-p2a] = "--enable-aspeed-p2a, --disable-aspeed-p2a"
 PACKAGECONFIG[aspeed-lpc] = "--enable-aspeed-lpc, --disable-aspeed-lpc"
 PACKAGECONFIG[nuvoton-lpc] = "--enable-nuvoton-lpc, --disable-nuvoton-lpc"
+PACKAGECONFIG[net-bridge] = "--enable-net-bridge, --disable-net-bridge"
 
 EXTRA_OECONF = "--disable-tests --disable-build-host-tool"