x86: crownbay: Enable writing MP table

Enable writing MP table for Intel Crown Bay board.

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
index 6c38504..2af93bc 100644
--- a/configs/crownbay_defconfig
+++ b/configs/crownbay_defconfig
@@ -18,4 +18,5 @@
 CONFIG_SPI_FLASH=y
 CONFIG_USE_PRIVATE_LIBGCC=y
 CONFIG_SYS_VSNPRINTF=y
+CONFIG_GENERATE_MP_TABLE=y
 CONFIG_DM_RTC=y