tools, perf: Documentation for the power events API
tools, perf: Documentation for the power events API

Provides documentation for the following:
- the new power trace API,
- the old (legacy) power trace API,
- the DEPRECATED Kconfig option usage.

Signed-off-by: Jean Pihet <24e638326d55c866138eb393a278ce90676b0635@ti.com>
Cc: Arjan van de Ven <9043bf4b08f6c93a2cb55d98c3494b123858348f@linux.intel.com>
Cc: dc31099191a1a231a41b126c85d59916cd0f555f@suse.de
Cc: Len Brown <b060cfa1096cc6e8be83699ddb4ed8a77dd63af5@intel.com>
Cc: Pavel Machek <2375fa63e2908bb2df59f606483a3aa92321db7a@ucw.cz>
Cc: Rafael J. Wysocki <a11f87183a953ab11f50fbafff689c5a7fa3506c@sisk.pl>
Cc: Steven Rostedt <43232e92d70cc7aa53504ad0397085ee47bad87f@goodmis.org>
Cc: Arnaldo Carvalho de Melo <293abb6b76d7791c0732cc517d38c4b5c734b87f@redhat.com>
Cc: b46218f6b44e9c202c4acd9f095c69546b4b0dff@lists.linux-foundation.org
LKML-Reference: <1294253342-29056-3-git-send-email-24e638326d55c866138eb393a278ce90676b0635@ti.com>
Signed-off-by: Ingo Molnar <9dbbbf0688fedc85ad4da37637f1a64b8c718ee2@elte.hu>

KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas