dnn-layer-math-unary-test: add unit test for acosh

Signed-off-by: Ting Fu <ting.fu@intel.com>

tests/dnn/dnn-layer-mathunary-test.c

@@ -52,6 +52,8 @@ static float get_expected(float f, DNNMathUnaryOperation op)
         return tanh(f);
     case DMUO_ASINH:
         return asinh(f);
+    case DMUO_ACOSH:
+        return acosh(f);
     default:
         av_assert0(!"not supported yet");
         return 0.f;
@@ -117,5 +119,7 @@ int main(int agrc, char **argv)
         return 1;
     if (test(DMUO_ASINH))
         return 1;
+    if (test(DMUO_ACOSH))
+        return 1;
     return 0;
 }