[M] Change in coreboot[master]: mainboard/msi/ms7d25: Add support for DDR5 variant

[Felix Singer (Code Review)]

Attention is currently required from: Michał Żygowski, Michał Kopeć.

Felix Singer has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/68448 )

Change subject: mainboard/msi/ms7d25: Add support for DDR5 variant
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Patch Set 2:

(1 comment)

File src/mainboard/msi/ms7d25/romstage_fsp_params.c:

https://review.coreboot.org/c/coreboot/+/68448/comment/e9167d56_e1a4dfd2 
PS2, Line 71: 	if (CONFIG(BOARD_MSI_Z690_A_PRO_WIFI_DDR4))
            : 		memcfg_init(memupd, &ddr4_mem_config, &dimm_module_spd_info, false);
            : 	if (CONFIG(BOARD_MSI_Z690_A_PRO_WIFI))
            : 		memcfg_init(memupd, &ddr5_mem_config, &dimm_module_spd_info, false);
How about adding two additional Kconfig options for DDR4 / DDR5 to the mainboard Kconfig? This scales much better when more variants are added.

In mainboard `Kconfig`:
```
if BOARD_MSI_MS7D25

config HAS_MEMORY_DDR4
    default n
    default y if BOARD_MSI_Z690_A_PRO_WIFI_DDR4

config HAS_MEMORY_DDR5
    default n
    default y if BOARD_MSI_Z690_A_PRO_WIFI

endif
```

Here, in `romstage_fsp_params.c`:
```
if (CONFIG(HAS_MEMORY_DDR4))
    memcfg_init(memupd, &ddr4_mem_config, &dimm_module_spd_info, false);

if (CONFIG(HAS_MEMORY_DDR5))
    memcfg_init(memupd, &ddr5_mem_config, &dimm_module_spd_info, false);
```