Fix AOSP file licenses

Fix AOSP file licenses

 * logprint.h → contains no implementations (it doesn't contain any
   Samsung implementations either but that is not a problem).

 * libdlogutil/lib.c → never had any AOSP code, the license text
   was copy-pasted from some other file. Some of the getters may
   have existed earlier but returning a member from a struct is
   its own specification so not really copyrightable.

 * shared/logprint.c → we thought we had removed the only AOSP func
   in e7aa8a06f7d400a494f06cf51dbce6a69757b5c5, but it looks like
   'log_add_filter_rule' has enough original AOSP parts that we'd
   like to err on the side of caution and consider it AOSP, thus
   the copyright note is reinstated until the func is rewritten.

Change-Id: Ie3c49f80261fc390bf5f7eca173963f0e93e21c5
Signed-off-by: Michal Bloch <m.bloch@samsung.com>