Fixed LSR opcode (shift would always be a crazy value like 65479 instead of 7).

Now SMG ucode jumps to the right command handlers. 
Unfortunately still no sound :(

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@3705 8ced0084-cf51-0410-be5f-012b33b47a6e

Source/Core/DSPCore/Src/DspIntArithmetic.cpp

@@ -609,7 +609,7 @@ void lsl(const UDSPInstruction& opc)
 // calculated by negating sign extended bits 0-6.
 void lsr(const UDSPInstruction& opc)
 {
-	u16 shift = -opc.ushift;
+	u16 shift = (u16) -(((s8)(opc.ushift << 2)) >> 2);
 	u64 acc = dsp_get_long_acc(opc.areg);
 	// Lop off the extraneous sign extension our 64-bit fake accum causes
 	acc &= 0x000000FFFFFFFFFFULL;