drm/panel: boe-tv101wum-nl6: Break some CMDS into helper functions

hj110iz-01a and tv110c9m-ll3 both nt36523 controller, and they have
some common cmds, so let's break them into helper functions.
Signed-off-by: Cong Yang <yangcong5@huaqin.corp-partner.google.com>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20240710084715.1119935-2-yangcong5@huaqin.corp-partner.google.comSigned-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240710084715.1119935-2-yangcong5@huaqin.corp-partner.google.com