target-mips: add missing check_dspr2 for multiply instructions

The emulator needs to check in hflags if DSP unit has been turned off before
it generates code for MUL_PH, MUL_S_PH, MULQ_S_W, and MULQ_RS_W.
Signed-off-by: NPetar Jovanovic <petar.jovanovic@imgtec.com>
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>

target-mips/translate.c

@@ -13400,6 +13400,7 @@ static void gen_mipsdsp_multiply(DisasContext *ctx, uint32_t op1, uint32_t op2,
     /* OPC_MULT_G_2E, OPC_ADDUH_QB_DSP, OPC_MUL_PH_DSP have
      * the same mask and op1. */
     case OPC_MULT_G_2E:
+        check_dspr2(ctx);
         switch (op2) {
         case  OPC_MUL_PH:
             gen_helper_mul_ph(cpu_gpr[ret], v1_t, v2_t, cpu_env);