env: x86: braswell: Set ENV_IS_IN_SPI_FLASH as default

Imply does not work for a Kconfig choice. Update ENV_IS_IN_SPI_FLASH
to be the default one for Intel Braswell.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/env/Kconfig b/env/Kconfig
index 02cb7cb..8c9d800 100644
--- a/env/Kconfig
+++ b/env/Kconfig
@@ -16,6 +16,7 @@
 	default ENV_IS_IN_FLASH if SH && !CPU_SH4
 	default ENV_IS_IN_SPI_FLASH if ARMADA_XP
 	default ENV_IS_IN_SPI_FLASH if INTEL_BAYTRAIL
+	default ENV_IS_IN_SPI_FLASH if INTEL_BRASWELL
 	default ENV_IS_IN_SPI_FLASH if INTEL_BROADWELL
 	default ENV_IS_IN_SPI_FLASH if NORTHBRIDGE_INTEL_IVYBRIDGE
 	default ENV_IS_IN_SPI_FLASH if INTEL_QUARK