Oops, he did it again. A single to right field. A walk. A run scoring on a two-out single. Another run scoring on a wild pitch. Like in two of his three previous starts, Yoshinobu Yamamoto was scored on in the first inning on Monday. The two runs Yamamoto allowed in the opening frame against the Houston Astros turned out to be of minimal importance, as the Dodgers’ offense awakened in an 8-3 victory at Daikin Park.  But the couple of early runs charged to Yamamoto point to a larger problem he’s been unable to solve since his move from Japan two years ago. Yoshinobu Yamamoto was scored on in the first inning — like in two of three of his previous starts. Getty Images In 55 regular-season starts over three major-league seasons, Yamamoto has a 4.60 earned-run average in the first inning.  “My first innings are really bad,” Yamamoto told reporters in Japanese.…