trivial: Update licenses

All of these files saw significant changes, so we update the license to
reflect this.

libplatsupport,imx: Move HW ops to driver level

Timer resource initialisation and the management of interrupts should
belong in the driver level and not the timer abstraction level. This
commits moves those operations down into the driver level for the i.MX
platforms.

Generify i.MX timers

This commit splits out imx timer functionality to remove the #ifdefs for
i.MX7. This is driven by the need on the RT kernel to use two EPITS
instead of an EPIT and GPT for the user level timer drivers, which makes
all the i.MX timers similar, in that they use a timer for timeouts and a
timer for the time, but different in that they all use different
combinations of timers.

plat/imx7: add initial support for imx7 SoC