UPSTREAM: random: remove some dead code of poolinfo

Since it is not being used, so delete it.

Signed-off-by: Yangtao Li <tiny.windzz@gmail.com>
Link: https://lore.kernel.org/r/20190607182517.28266-5-tiny.windzz@gmail.com


Signed-off-by: Theodore Ts'o <tytso@mit.edu>
(cherry picked from commit 09a6d00a42ce0e63e2a15be3d070974bcc656ec7)
Signed-off-by: Mark Salyzyn <salyzyn@google.com>
Bug: 148665638
Change-Id: I9499a86112bb4ad468079f3b27b48055effb2d4a