Staging: spectra: depend on X86_MRST

lld_nand fails to build on arches without virt_to_bus. Since this driver
is specifically for hardware enablment on Moorestown, this patch adds
Moorestown MID support as a dependency.
Signed-off-by: NJeff Mahoney <jeffm@suse.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/staging/spectra/Kconfig

@@ -2,6 +2,7 @@
 menuconfig SPECTRA
 	tristate "Denali Spectra Flash Translation Layer"
 	depends on BLOCK
+	depends on X86_MRST
 	default n
 	---help---
 	  Enable the FTL pseudo-filesystem used with the NAND Flash