add screen and i2ctools

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
diff --git a/classes/obmc-phosphor-image.bbclass b/classes/obmc-phosphor-image.bbclass
index c50c84a..9a13f7f 100644
--- a/classes/obmc-phosphor-image.bbclass
+++ b/classes/obmc-phosphor-image.bbclass
@@ -36,4 +36,6 @@
 IMAGE_INSTALL += " \
        bash \
        packagegroup-obmc-phosphor-apps-extras \
+       i2c-tools \
+       screen \
        "