UNIF: Update boards based on last commit

- fixes (if necessary), update and cleanup the following boards that now dont need alternate mappings:
- this is part of migrating unif to be usuable in ines mappers
- boards affected in this commit are:
  SUPERVISION16IN1, GS-2004, GS-2013, UNL-SMB2J, MARIO1-MALEE2, UNL-SA-9602B, UNL-KS106C / RESETNROM-XIN1
  UNL-AC08, NES-NTBROM, BMC-K-3033, BMC-GN-26, BMC-GHOSTBUSTERS63IN1, BMC-830425C-4391T
  BMC-830134C, BMC-891227 / BMC-CTC-12IN1, BMC-JC-016-2, UNL-T4A54A, UNL-8157, BMC-T-262
  (might have forgotten to list some...)

src/boards/8157.c

@@ -37,15 +37,9 @@ static void Sync(void) {
 	uint32 base = ((cmdreg & 0x060) | ((cmdreg & 0x100) >> 1)) >> 2;
 	uint32 bank = (cmdreg & 0x01C) >> 2;
 	uint32 lbank = (cmdreg & 0x200) ? 7 : ((cmdreg & 0x80) ? bank : 0);
-	if (PRGptr[1]) {
-		chip = base >> 3;
-		if (chip > PRGchip_max) chip &= PRGchip_max;
-		setprg16r(chip, 0x8000, bank);        /* for versions with split ROMs */
-		setprg16r(chip, 0xC000, lbank);
-	} else {
-		setprg16(0x8000, base | bank);
-		setprg16(0xC000, base | lbank);
-	}
+
+	setprg16(0x8000, base | bank);
+	setprg16(0xC000, base | lbank);
 	setmirror(((cmdreg & 2) >> 1) ^ 1);
 }