arm: add useful headers from the Linux kernel

We're going to need PSR bit defines and pt_regs. We'll also need
pt_regs offsets in assembly code. This patch adapts the Linux
kernel's ptrace.h and gen

arm: add useful headers from the Linux kernel

We're going to need PSR bit defines and pt_regs. We'll also need
pt_regs offsets in assembly code. This patch adapts the Linux
kernel's ptrace.h and generated/asm-offsets.h to this framework.
It also adapts cp15.h from the kernel, since we'll need bit defines
from there too.

Signed-off-by: Andrew Jones <drjones@redhat.com>
Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
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v4: much improved asm-offsets.h generation based on Kbuild

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