LU-14651 build: remove KALLSYMS build requirement

LU-14651 build: remove KALLSYMS build requirement

Now that kallsyms is no longer exported some distros kernels are
disabling it by default. If kallsyms is disabled lustre will fail
configure. Remove this hard requirmenet.

Test-Parameters: trivial
Change-Id: I710433e99afd75eea6a3bf1d77878b97beaed605
Signed-off-by: James Simmons <jsimmons@infradead.org>
Reviewed-on: https://review.whamcloud.com/46070
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Jian Yu <yujian@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>