treewide: Add SPDX license identifier - Makefile/Kconfig

Add SPDX license identifiers to all Make/Kconfig files which:

- Have no license information of any form

These files fall under the project license, GPL v2 only. The resulting SPDX
license identifier is:

GPL-2.0-only

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

ARM: mediatek: clean up mach-mediatek/Makefile

Kbuild descends into arch/arm/mach-mediatek/Makefile only when
CONFIG_ARCH_MEDIATEK is enabled. So, obj-$(CONFIG_ARCH_MEDIATEK)
is always equivalent to obj-y in this Makefile.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>

ARM: mediatek: add smp bringup code

Add support for booting secondary CPUs on mt6589, mt8127
and mt8135.

Signed-off-by: Yingjoe Chen <yingjoe.chen@mediatek.com>
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>

arm: add basic support for Mediatek MT6589 boards

This adds a generic devicetree board file and a dtsi for boards
based on MT6589 SoCs from Mediatek.

Apart from the generic parts (gic, clocks) the only component
currently supported are the timers.

Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>