Allow native HALs to have <transport> tag.

assemble_vintf should not drop the empty <transport/> tag for
native HALs, otherwise older versions of libvintf cannot parse
the file.

Test: m system_manifest.xml -j  and manually look at the file
Test: sideload package from O DR
Bug: 67653129
Change-Id: I403031f1546e7a26b0ad40b992d191ee3c7b80c6
1 file changed