cpu/intel/smm/gen1: Add pineview to the check for alt SMRR MSR's

Intel pineview has the same alternative SMRR MSR and
IA32_FEATURE_CONTROL enable bit as core2 CPUs so properly check for
that before enabling this feature.

This also exposes a function to fetch whether alternative SMRR MSR's
ought to be used.

Change-Id: Iccaabfa95b8dc4366b8e7e2c2a526081d4af0efa
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/30868
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/cpu/intel/smm/gen1/smi.h

@@ -19,3 +19,5 @@ u32 northbridge_get_tseg_base(void);
 u32 northbridge_get_tseg_size(void);
 int cpu_get_apic_id_map(int *apic_id_map);
 void northbridge_write_smram(u8 smram);
+
+bool cpu_has_alternative_smrr(void);