ASoc: pcm6240: Remove unnecessary name-prefix for all the controls

Adding name-prefix for each audio controls is a redundant, because
name-prefix will be automatically added behind the control name when
creating a new control.

Signed-off-by: Shenghao Ding <shenghao-ding@ti.com>
Link: https://patch.msgid.link/20240705064846.1723-1-shenghao-ding@ti.com


Signed-off-by: Mark Brown <broonie@kernel.org>