Revert "Kconfig: separate memory mapped boot device from SPI"

This reverts commit a83bbf5854.
This was submitted out of order.

Change-Id: Ic5a28faf94c1f1901a72e46343722eb4224c5086
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/16226
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Nico Huber <nico.h@gmx.de>

src/drivers/spi/Kconfig

@@ -37,6 +37,13 @@ config SPI_ATOMIC_SEQUENCING
 	  in the SPI controller. Hardware manages the transaction instead of
 	  software. This is common on x86 platforms.
 
+config SPI_FLASH_MEMORY_MAPPED
+	bool
+	default y if ARCH_X86
+	default n if !ARCH_X86
+	help
+	  Inform system if SPI is memory-mapped or not.
+
 config SPI_FLASH_SMM
 	bool "SPI flash driver support in SMM"
 	default n