perf/x86/intel/pt: Export pt_cap_get()

[ Upstream commit f6d079ce867d679e4dffef5b3112c7634215fd88 ]

pt_cap_get() is required by the upcoming PT support in KVM guests.

Export it and move the capabilites enum to a global header.

As a global functions, "pt_*" is already used for ptrace and
other things, so it makes sense to use "intel_pt_*" as a prefix.

Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Chao Peng <chao.p.peng@linux.intel.com>
Signed-off-by: Luwei Kang <luwei.kang@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Stable-dep-of: ad97196379d0 ("perf/x86/intel/pt: Fix a topa_entry base address calculation")
Signed-off-by: Sasha Levin <sashal@kernel.org>
(cherry picked from commit bea2d4588e90f56da62b0dd9099484a42498b08a)
Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com>