drivers/clk/qcom: Remove 2/3 divider from frac_table_pixel

In case of RGB666, 2/3 divider was getting selected, leading
to continuous UNDERFLOW. 2/3 divider is recommended by HPG
for RGB101010 4lanes. Since RGB101010 is not supported, 2/3
can be removed from the list and the recommended 4/9 divider
for RGB666 gets selected.

Change-Id: I3d3f071f5a90eb06d69e66c29405e472cc19839e
Signed-off-by: Lipsa Rout <lrout@codeaurora.org>