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>

configs/crownbay_defconfig

@@ -18,4 +18,5 @@ CONFIG_CPU=y
 CONFIG_SPI_FLASH=y
 CONFIG_USE_PRIVATE_LIBGCC=y
 CONFIG_SYS_VSNPRINTF=y
+CONFIG_GENERATE_MP_TABLE=y
 CONFIG_DM_RTC=y