x86: ivybridge: Use common CPU init code

The existing ivybridge code predates the normal multi-core CPU init, and
it is not used. Remove it and add CPU nodes to the device tree so that all
four CPUs are set up. Also enable the 'cpu' command.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/configs/chromebook_link_defconfig b/configs/chromebook_link_defconfig
index baa0ed8..bcb34f5 100644
--- a/configs/chromebook_link_defconfig
+++ b/configs/chromebook_link_defconfig
@@ -5,7 +5,9 @@
 CONFIG_TARGET_CHROMEBOOK_LINK=y
 CONFIG_HAVE_MRC=y
 CONFIG_ENABLE_MRC_CACHE=y
+CONFIG_SMP=y
 CONFIG_HAVE_VGA_BIOS=y
+CONFIG_CMD_CPU=y
 # CONFIG_CMD_IMLS is not set
 # CONFIG_CMD_FLASH is not set
 CONFIG_CMD_GPIO=y
@@ -17,6 +19,7 @@
 CONFIG_CMD_TPM=y
 CONFIG_CMD_TPM_TEST=y
 CONFIG_OF_CONTROL=y
+CONFIG_CPU=y
 CONFIG_CMD_CROS_EC=y
 CONFIG_CROS_EC=y
 CONFIG_CROS_EC_LPC=y