x86: Add crownbay defconfig and config.h

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/configs/crownbay_defconfig b/configs/crownbay_defconfig
new file mode 100644
index 0000000..ce90553
--- /dev/null
+++ b/configs/crownbay_defconfig
@@ -0,0 +1,6 @@
+CONFIG_SYS_EXTRA_OPTIONS="SYS_TEXT_BASE=0xfff00000"
+CONFIG_X86=y
+CONFIG_TARGET_CROWNBAY=y
+CONFIG_OF_CONTROL=y
+CONFIG_OF_SEPARATE=y
+CONFIG_DEFAULT_DEVICE_TREE="crownbay"