soc/intel/xeon_sp/cpx: display SystemMemoryMapHob fields

soc/intel/xeon_sp/cpx: display SystemMemoryMapHob fields

SystemMemoryMapHob is necessary for SMBIOS type 17 among other things.
It is a fairly large structure, so the pointer to the data instead of
the structure itself, is included in the HOB. Use pointer to
SystemMemoryMapHob structure to interpret SystemMemoryHob HOB body.

Adjust the structure definition to match with CPX-SP ww28 release.

Display more fields to ensure the structure definition is correct.

TEST=Boot DeltaLake server, and check field values of SystemMemoryMapHob
to make sure they are correct:
0x7590a090, 0x00000020 bytes: HOB_TYPE_GUID_EXTENSION
        f8870015-6994-4b98-95a2bd56da91c07f: FSP_SYSTEM_MEMORYMAP_HOB_GUID
================== MEMORY MAP HOB DATA ==================
hob: 0x777f7000, structure size: 0x6c88
        lowMemBase: 0x0, lowMemSize: 0x20, highMemBase: 0x40, highMemSize: 0x5d0
        memSize: 0x600, memFreq: 0xb76
        NumChPerMC: 3
        SystemMemoryMapElement Entries: 2, entry size: 16
                memory_map 0 BaseAddress: 0x0, ElementSize: 0x20, Type: 0x1
                memory_map 1 BaseAddress: 0x40, ElementSize: 0x5d0, Type: 0x1
        BiosFisVersion: 0x0
        MmiohBase: 0x80000
0x777f7000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
...
Signed-off-by: Jonathan Zhang <jonzhang@fb.com>
Change-Id: I271bcbd6030276b8fcd99d5b4f2c93f034dd9b52
Reviewed-on: https://review.coreboot.org/c/coreboot/+/43336
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>