Remove GPL license from generated DTSes

GPL license is causing problems for non GPL projects
which customers want to use.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
pl330: Generate apb_pclk

Without it driver is not probed.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>