soc/intel/apollolake: Provide chipset value for ifdtool

Change-Id: I99454a9fca3b677a389bcaf7693ff4e18415c9ad
Signed-off-by: Andrey Petrov <andrey.petrov@intel.com>
Reviewed-on: https://review.coreboot.org/17259
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/soc/intel/apollolake/Kconfig

@@ -260,4 +260,8 @@ config SMM_RESERVED_SIZE
 	hex
 	default 0x100000
 
+config IFD_CHIPSET
+	string
+	default "aplk"
+
 endif