dev: gcdb: display: roundup the pixel clock for msm8996

The pixel clock value for msm8996 is used to generate the
n2 divider. This n2 divider is rounded off based on bitclock
rate. The pixel clock rate without roundoff generates the
invalid n2 divider and causes the display boot up failure.

Change-Id: I12990ddea7a08cf14a44b72435af8fecb8668613
1 file changed