soc/intel/fsp_baytrail: Drop support

Relocatable ramstage, postcar stage and C_ENVIRONMENT_BOOTBLOCK are
now mandatory features, which this platform lacks.

Change-Id: I0b0344f1ebed12207a77c985f27893a1353c0925
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/36982
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>
Reviewed-by: David Hendricks <david.hendricks@gmail.com>

src/lib/reg_script.c

@@ -28,8 +28,7 @@
 #include <cpu/x86/msr.h>
 #endif
 
-#define HAS_IOSF (CONFIG(SOC_INTEL_BAYTRAIL) || \
-		CONFIG(SOC_INTEL_FSP_BAYTRAIL))
+#define HAS_IOSF (CONFIG(SOC_INTEL_BAYTRAIL))
 
 #if HAS_IOSF
 #include <soc/iosf.h>	/* TODO: wrap in <soc/reg_script.h, remove #ifdef? */