x86: Support Intel Cherry Hill board

This adds support to Intel Cherry Hill board, a board based on
Intel Braswell SoC. The following devices are validated:

- serial port as the serial console
- on-board Realtek 8169 ethernet controller
- SATA AHCI controller
- EMMC/SDHC controller
- USB 3.0 xHCI controller
- PCIe x1 slot with a graphics card
- ICH SPI controller with an 8MB Macronix SPI flash
- Integrated graphics device as the video console

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/board/intel/cherryhill/start.S b/board/intel/cherryhill/start.S
new file mode 100644
index 0000000..11af9de
--- /dev/null
+++ b/board/intel/cherryhill/start.S
@@ -0,0 +1,9 @@
+/*
+ * Copyright (C) 2017, Bin Meng <bmeng.cn@gmail.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+.globl early_board_init
+early_board_init:
+	jmp	early_board_init_ret