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games/nes: add mapper 7 support

--- a/sys/src/games/nes/mem.c

+++ b/sys/src/games/nes/mem.c

@@ -108,9 +108,21 @@

 	n = 0;

 }

+static void

+mmc7(int v, u8int p)

+{

+	if(v < 0){

+		nrom(-1, 0);

+		p = 0;

+	}

+	prgb[0] = prg + (p & 3) * 0x8000;

+	prgb[1] = prgb[0] + 0x4000;

+}

+

 void (*mapper[256])(int, u8int) = {

 	[0] nrom,

 	[1] mmc1,

+	[7] mmc7,

 };

 static void