ring-buffer: Remove unused function __rb_data_page_index()

This fixes the following warning when building with clang:

kernel/trace/ring_buffer.c:1842:1: error: unused function
    '__rb_data_page_index' [-Werror,-Wunused-function]

Link: http://lkml.kernel.org/r/20170518001415.5223-1-mka@chromium.org

Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>