dev: Set HDLCD default pixel clock for 1080p @ 60Hz
dev: Set HDLCD default pixel clock for 1080p @ 60Hz

This patch changes the default pixel clock to effectively generate
1080p resolution at 60 frames per second. It is dependent upon the
kernel device tree file using the specified resolution / display
string in the comments.
(transplanted from 7fef26827810aa75ea91f4f114434e93b5a25881)

andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin