Last Sunday, the Yoga Solution studio was filled with the relaxing sound of "namastes," "oms" and a meditation gong. But what spoke the loudest, perhaps, were three chants of "Chi." On Oct. 4, 10 people came together to practice yoga and send "chi," or life force energy, to Chi Cheng, bassist for the Grammy-award-winning Sacramento band, Deftones. Cheng has been in a coma since Nov. 4, 2008, after being involved in a motor accident. The event was organized by yoga instructor Julie McKechnie, who normally teaches classes for members of the Gold River Racquet Club. Her friend Jennifer Sadugor, the owner of Yoga Solution, 887 57th St., allowed her to use her studio for the fundraising gathe