obmc-phosphor-image: Add lrzsz

This adds xmodem receive shell tools so we can move files onto or off of
the BMC over a serial console (without a network connection). This is
helpful when debugging issues with failed network connectivity.

Change-Id: Id12a3704c690230cb9111aa2f6f50962527e3987
Signed-off-by: Joel Stanley <joel@jms.id.au>
diff --git a/meta-phosphor/classes/obmc-phosphor-image.bbclass b/meta-phosphor/classes/obmc-phosphor-image.bbclass
index bad16ba..8b8149c 100644
--- a/meta-phosphor/classes/obmc-phosphor-image.bbclass
+++ b/meta-phosphor/classes/obmc-phosphor-image.bbclass
@@ -92,6 +92,7 @@
         ffdc \
         rsync \
         rng-tools \
+        lrzsz \
         "
 
 OBMC_IMAGE_EXTRA_INSTALL ?= ""