meta-google: phosphor-networkd: Remove u-boot env for hoth

We can't safely store this data, so we don't.

Change-Id: I9e0f99423485cf41ff4f9e3b333f4833572f6b73
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/meta-google/recipes-phosphor/network/phosphor-network_%.bbappend b/meta-google/recipes-phosphor/network/phosphor-network_%.bbappend
new file mode 100644
index 0000000..4a1cbe1
--- /dev/null
+++ b/meta-google/recipes-phosphor/network/phosphor-network_%.bbappend
@@ -0,0 +1,3 @@
+# Platforms with Hoth don't use the U-Boot environment since this would allow
+# bypassing attestation.
+PACKAGECONFIG_remove_hoth = "uboot-env"