treewide: Convert files covered by ARM copyright to SPDX ...

According to Marc Zyngier, former employee at ARM, the company owns the
copyright for code created by its employees. Convert accordingly to SPDX
with the usual rearrangements. Also dropped Marc's email address which
doesn't work any more.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

clk: migrate to SPDX-License-Identifier use ...

Some of these are a product of source sync with Linux, the other were
done with macro assistance by searching for /later/, deleting license text,
adding appropriate SPDX-License-Identifier and manual post-review.

Devices without a license indicated where assumed GPL-2.0-only according
with the project's license.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

clk: sp810: hardwire parent to 1MHz clock ...

This works around a limitation in our handling of the vexpress
config bus. For now just hardcode the clock parent to the 1MHz
clock, which is the default as emulated by QEMU and also the
setting the Linux kernel will configure later.

This fixes the vexpress clocksource running at a wrong rate
leading to bogus delays and sleep times.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

clk: versatile: add basic clocks ...

This adds the necessary basic clocks used on the ARM versatile
platforms.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>