meta-google: Set default timezone as PDT

This is the prod configuration.

Change-Id: I04c33362cf874637caa528779c57bcacfca50201
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/meta-google/recipes-phosphor/images/obmc-phosphor-image.bbappend b/meta-google/recipes-phosphor/images/obmc-phosphor-image.bbappend
index d421fdf..68ae270 100644
--- a/meta-google/recipes-phosphor/images/obmc-phosphor-image.bbappend
+++ b/meta-google/recipes-phosphor/images/obmc-phosphor-image.bbappend
@@ -9,6 +9,7 @@
 
 # Google BMC (gBMC) specific installs
 OBMC_IMAGE_EXTRA_INSTALL:append:gbmc = " iproute2 iproute2-ss"
+OBMC_IMAGE_EXTRA_INSTALL:append:gbmc = " tzdata-core"
 OBMC_IMAGE_EXTRA_INSTALL:append:gbmc = " gbmc-systemd-config"
 OBMC_IMAGE_EXTRA_INSTALL:append:gbmc = " gbmc-iperf3"
 OBMC_IMAGE_EXTRA_INSTALL:append:gbmc = " authorized-keys-comp"