Update VInterp instructions with true16 and fake16 formats. This patch includes instructions: v_interp_p10_f16_f32 v_interp_p2_f16_f32 v_interp_p10_rtz_f16_f32 v_interp_p2_rtz_f16_f32 dasm test vinterp-fake16.txt is removed and the testline are merged into vinterp.txt which handles both true16/fake16 cases