libgpiod: disable the 2.0 version temporarily

The 2.0 version of libgpiod broke backward compatibility and requires
changes in multiple repos within OpenBMC.  Set PREFERRED_VERSION back
to 1.6.4, which is still shipping with meta-openembedded, until we have
time to resolve this.

Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
Change-Id: I2aca89e9bc9eaba84f95e006bfa0647553c37f54
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
diff --git a/meta-phosphor/conf/distro/include/phosphor-base.inc b/meta-phosphor/conf/distro/include/phosphor-base.inc
index 8d352b2..9d5c7e1 100644
--- a/meta-phosphor/conf/distro/include/phosphor-base.inc
+++ b/meta-phosphor/conf/distro/include/phosphor-base.inc
@@ -141,3 +141,5 @@
 # should be used everywhere in phosphor, but some layers may append this with
 # their own organization(s).
 OBMC_ORG_YAML_SUBDIRS += " org/freedesktop xyz/openbmc_project"
+
+PREFERRED_VERSION_libgpiod = "1.6.4"