libbpf: Normalize PT_REGS_xxx() macro definitions

Refactor PT_REGS macros definitions in  bpf_tracing.h to avoid excessive
duplication. We currently have classic PT_REGS_xxx() and CO-RE-enabled
PT_REGS_xxx_CORE(). We are about to add also _SYSCALL variants, which
would require excessive copying of all the per-architecture definitions.

Instead, separate architecture-specific field/register names from the
final macro that utilize them. That way for upcoming _SYSCALL variants
we'll be able to just define x86_64 exception and otherwise have one
common set of _SYSCALL macro definitions common for all architectures.

Signed-off-by: Andrii Nakryiko <[email protected]>
Signed-off-by: Alexei Starovoitov <[email protected]>
Tested-by: Ilya Leoshkevich <[email protected]>
Acked-by: Yonghong Song <[email protected]>
Acked-by: Ilya Leoshkevich <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]

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