He subbed in just in the Knick of time. Knicks superfan Rachel Kim, known for pampering her Jalen Brunson doll and bringing the team good luck with “reverse voodoo,” brought the plushie back for the playoffs. And ever since his return to social media, the team has won three straight games, advancing to the semifinals. “At this point, I’m like, ‘Is it me?'” Kim told The Post, a day after the Knicks clinched Round 1 of the Eastern Conference first-round playoffs by crushing the Hawks, 140-89. Before Thursday’s Game 6 blowout, she posted a clip icing and rotating “Lil Jalen’s” ankles, massaging and icing his hands — and even spraying a hydrating and calming mist on his face. He is also sporting a new good luck charm — hot dog barrettes — gifted by a NYC artist and fellow Knicks fan.…