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

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

Change-Id: I67449a481cf246f52d1c34a9c065d3c927106f12
Signed-off-by: Benjamin Fair <benjaminfair@google.com>
diff --git a/recipes-phosphor/ipmi/phosphor-ipmi-flash_git.bb b/recipes-phosphor/ipmi/phosphor-ipmi-flash_git.bb
index 3c11d85..534e4ec 100644
--- a/recipes-phosphor/ipmi/phosphor-ipmi-flash_git.bb
+++ b/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"