ARM: mstar: SMP support

This patch adds SMP support for MStar/Sigmastar chips that have a second core
like those in the infinity2m family.

So far only single and dual core chips have been found so this does
the bare minimum to boot the second core. From what I can tell not having
the "holding pen" code to handle multiple cores is fine if there is only
one core the will get booted. This might need to be reconsidered if chips
with more cores turn up.

Signed-off-by: Daniel Palmer <daniel@0x0f.com>
Link: https://lore.kernel.org/r/20201201134330.3037007-11-daniel@0x0f.com'
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

ARM: mstar: Add infinity2m support

The infinity2m series of chips are like the other Mstar/Sigmastar
chips in that they have a Cortex A7 system with DDR memory integrated
in a single package.

The infinity2m chips are intended for recording the incoming streams
from IP cameras. So instead of video encoders they have video decoders,
instead of a camera interface they have display hardware and so on.

Aside from the above points the big difference about these chips is that
they include a second Cortex A7 core.

Signed-off-by: Daniel Palmer <daniel@0x0f.com>
Link: https://lore.kernel.org/r/20201201134330.3037007-5-daniel@0x0f.com'
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

ARM: mstar: Add machine for MStar/Sigmastar Armv7 SoCs

Initial support for the MStar/Sigmastar Armv7 based IP camera
and dashcam SoCs.

These chips are interesting in that they contain a Cortex-A7,
peripherals and system memory in a single tiny QFN package that
can be hand soldered allowing almost anyone to embed Linux
in their projects.

Signed-off-by: Daniel Palmer <daniel@0x0f.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>