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>

arch/x86/cpu/braswell/Kconfig

@@ -12,7 +12,6 @@ config INTEL_BRASWELL
 	imply HAVE_INTEL_ME
 	imply HAVE_VBT
 	imply ENABLE_MRC_CACHE
-	imply ENV_IS_IN_SPI_FLASH
 	imply AHCI_PCI
 	imply ICH_SPI
 	imply MMC

env/Kconfig

@@ -16,6 +16,7 @@ choice
 	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