add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/mips/dec/tc.c
..
..
@@ -52,7 +52,7 @@
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 	case MACH_DS5900:
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 		tbus->ext_slot_base = 0x20000000;
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 		tbus->ext_slot_size = 0x20000000;
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-		/* fall through */
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+		fallthrough;
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 	case MACH_DS5000_1XX:
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 		tbus->num_tcslots = 3;
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 		break;