soc/intel/common: Calculate and configure SF Mask 2

As per TGL EDS, two ways will be controlled with one bit of SF QoS
register hence, this patch introduces SF_MASK_2WAYS_PER_BIT Kconfig to
allow SoC users to select SF_MASK_2WAYS_PER_BIT to follow the EDS
recommendation.

Calculate SF masks 2:
1. if CONFIG_SF_MASK_2WAYS_PER_BIT:
        a. data_ways = data_ways / 2

Also, program SF Mask#2 using below logic:
2. Set SF_MASK_2 = (1 << data_ways) - 1

Change-Id: I442bed75f13d26f357cfb32c54c5fe9efa4b474b
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56717
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>

src/include/cpu/x86/msr.h

@@ -88,6 +88,8 @@
 #define IA32_HWP_CAPABILITIES		0x771
 #define IA32_HWP_REQUEST		0x774
 #define IA32_HWP_STATUS			0x777
+#define IA32_SF_QOS_INFO		0xc87
+#define  IA32_SF_WAY_COUNT_MASK		0x3f
 #define IA32_PQR_ASSOC			0xc8f
 /* MSR bits 33:32 encode slot number 0-3 */
 #define  IA32_PQR_ASSOC_MASK		(1 << 0 | 1 << 1)