samples: use printf/printk directly instead of macros

In many cases there is no need to define a macro for printing to
the console, just use the correct variant directly.

Jira: ZEP-240
Change-Id: I9952deda4bfc60424f01fca2443d037562d13d0d
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
13 files changed