ANDROID: GKI: kernel: Export symbols needed by msm_minidump.ko and minidump_log.ko

These symbols are used by these modules. Export them so that these
modules can be loaded.

Bug: 149258398
Test: compile
Change-Id: Ie29c2811c07944b5a01dbc47b7a60dd56fe2aa5b
Signed-off-by: Saravana Kannan <saravanak@google.com>
(cherry picked from commit 9d5b6d29f017e1ae5df2dac53694382b24393f5f)
Signed-off-by: Will McVicker <willmcvicker@google.com>