[MSI] Add STM defconfigs #887

Job	Run time
build_protectli (protectli, vp46xx)	14m 11s
build_novacustom (novacustom, nv4x_adl)	13m 52s
build_msi (msi, ms7d25, ddr4)	16m 22s
build_novacustom (novacustom, ns5x_adl)	15m 33s
build_msi (msi, ms7d25, ddr4, _stm)	13m 27s
build_novacustom (novacustom, nv4x_tgl)	9m 10s
build_msi (msi, ms7d25, ddr5)	13m 25s
build_novacustom (novacustom, ns5x_tgl)	12m 56s
build_msi (msi, ms7d25, ddr5, _stm)	10m 50s
build_msi (msi, ms7e06, ddr4)	10m 3s
build_msi (msi, ms7e06, ddr4, _stm)	13m 39s
build_msi (msi, ms7e06, ddr5)	15m 56s
build_msi (msi, ms7e06, ddr5, _stm)	10m 59s
	2h 50m 23s

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