ANDROID: set rewrite_absolute_paths_in_config for GKI aarch64.

For GKI targets with kmi_symbol_list set,
also set rewrite_absolute_paths_in_config to True
so that CONFIG_UNUSED_KSYMS_WHITELIST is not an
absolute path any more, increasing reproducibility
on different machines.

This is made possible with d94e1657
"Revert^2 "BACKPORT: FROMGIT: module: allow UNUSED_KSYMS_WHITELIST to be relative against objtree.""
so that Kbuild recognizes relative paths by searching
$(objtree) first.

This does not change x86 builds because it
doesn't have kmi_symbol_list set.

This change does not affect device builds like
db845c, rockpi and fips140. Adding the attribute
to these targets would be okay, but it is not
covered by this change.

Bug: 333769605
Bug: 342390208
Change-Id: I844c251979bae5277474837eaa055f1346b0afa2
Signed-off-by: Yifan Hong <elsk@google.com>