soc/intel/common: Add InSMM.STS support

Tested on HP 280 G2, SMMSTORE v1 and v2 still work.

Other tests:
- If one does not set BIOS_CONTROL bit WPD, SMMSTORE breaks.
- If one does not write the magic MSR `or 1`, SMMSTORE breaks.

Change-Id: Ia90c0e3f8ccf895bfb6d46ffe26750393dab95fb
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/51796
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>

src/include/cpu/intel/msr.h

@@ -26,6 +26,8 @@
 #define  AESNI_DISABLE		(1 << 1)
 #define  AESNI_LOCK		(1 << 0)
 
+#define MSR_SPCL_CHIPSET_USAGE	0x1fe
+
 #define MSR_PKG_C10_RESIDENCY	0x632
 
 #endif /* CPU_INTEL_MSR_H */