platform/x86/amd/pmc: Add 1Ah family series to STB support list

AMD newer platforms, (AMDI000A or family 1Ah series) also supports the STB
functionality. Add this to amd_pmc_is_stb_supported().

Signed-off-by: Sanket Goswami <[e-mail]>
Signed-off-by: Shyam Sundar S K <[e-mail]>
Reviewed-by: Ilpo Järvinen <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Hans de Goede <[e-mail]>

drivers/platform/x86/amd/pmc/pmc.c

···
 	case AMD_CPU_ID_YC:
 	case AMD_CPU_ID_CB:
 	case AMD_CPU_ID_PS:
+	case PCI_DEVICE_ID_AMD_1AH_M20H_ROOT:
 		return true;
 	default:
 		return false;