Correct CORE-V ChangeLogs in line with GNU standards

Files changed:

	* bfd/ChangeLog.COREV: Correct in line with GNU standards.
	* gas/ChangeLog.COREV: Likewise.
	* include/ChangeLog.COREV: Likewise.
	* opcodes/ChangeLog.COREV: Likewise.
	* ld/ChangeLog.COREV: Removed.

Signed-off-by: Jessica Mills <jessica.mills@embecosm.com>