Add bug component to OWNERS files, to follow go/xts-owners-policy.

Also remove inactive contributor dimitry@ from libnativeloader and put
myself first as the primary contact for libnativeloader and
libnativebridge.

Test: presubmits
Bug: 261015546
Bug: 261015469
Change-Id: I6f68584ffbb71bc2d5260ced766b2da97a51b823
2 files changed