Merge tag 'arm-soc/for-4.18/soc' of https://github.com/Broadcom/stblinux into next/soc

This pull request contains Broadcom ARM-based machine/platform files
changes for 4.18, please pull the following:

- Doug updates arch/arm/include/asm/cpuinfo.h such that this header file
can be used by both C and assembly code. This particular change will
also be included in a Sunxi pull request to support A83T SMP support.

- Doug also updates our DEBUG_LL routine to support newer chips such as
7278 which have a version 7 memory map which moves the registers from
physical address 0xf000_0000 down to 0x0800_0000. This requires us to
look up the processor MIDR and determine the base address from the
PERIPHBASE register.

- Florian updates the Brahma-B15 read-ahead cache implementation such
that it works on the Brahma-B53 CPUs, which also have an identical
read-ahead cache implementation, with a different set of offsets. He
also provides the Brahma-B15 MIDR definition such that it can be used by
other pieces of code in the future.

* tag 'arm-soc/for-4.18/soc' of https://github.com/Broadcom/stblinux:
  ARM: brcmstb: Add support for the V7 memory map
  ARM: add Broadcom Brahma-B15 main ID definition
  ARM: add Broadcom Brahma-B53 main ID definition
  ARM: Allow this header to be included by assembly files
  ARM: B15: Update to support Brahma-B53

Signed-off-by: Olof Johansson <olof@lixom.net>