Add initrd support to all kernel configs.

chromeos/config/config.common.chromeos

Index: chromeos/config/config.common.chromeos
diff --git a/chromeos/config/config.common.chromeos b/chromeos/config/config.common.chromeos
index 510d8646842f6d2d262b7b9794240b2540e98bea..7809128f23837691027abd4675157b5e4a0d9032 100644
--- a/chromeos/config/config.common.chromeos
+++ b/chromeos/config/config.common.chromeos
@@ -50,6 +50,7 @@ CONFIG_BLK_DEV_COMPCACHE=m
 # CONFIG_BLK_DEV_COMPCACHE_DEBUG is not set
 # CONFIG_BLK_DEV_COMPCACHE_STATS is not set
 # CONFIG_BLK_DEV_COW_COMMON is not set
+CONFIG_BLK_DEV_INITRD=y
 # CONFIG_BLK_DEV_INTEGRITY is not set
 # CONFIG_BLK_DEV_NBD is not set
 CONFIG_BLOCK=y
@@ -151,6 +152,7 @@ CONFIG_DEBUG_KERNEL=y
 # CONFIG_DEBUG_VM is not set
 # CONFIG_DEBUG_WRITECOUNT is not set
 # CONFIG_DECNET is not set
+CONFIG_DECOMPRESS_GZIP=y
 # CONFIG_DEFAULT_DEADLINE is not set
 CONFIG_DEFAULT_MMAP_MIN_ADDR=4096
 # CONFIG_DEFAULT_NOOP is not set
@@ -286,6 +288,7 @@ CONFIG_INET_LRO=y
 # CONFIG_INET_XFRM_MODE_TRANSPORT is not set
 # CONFIG_INET_XFRM_MODE_TUNNEL is not set
 # CONFIG_INET_XFRM_TUNNEL is not set
+CONFIG_INITRAMFS_SOURCE=""
 CONFIG_INIT_ENV_ARG_LIMIT=32
 CONFIG_INOTIFY=y
 CONFIG_INOTIFY_USER=y
@@ -467,6 +470,7 @@ CONFIG_RCU_FANOUT=32
 # CONFIG_RCU_TORTURE_TEST is not set
 # CONFIG_RCU_TRACE is not set
 # CONFIG_RDS is not set
+CONFIG_RD_GZIP=y
 # CONFIG_REGULATOR is not set
 # CONFIG_REISERFS_FS is not set
 CONFIG_RT2X00=m