AUTHORS: Move src/arch/arm copyrights into AUTHORS file

As discussed on the mailing list and voted upon, the coreboot project
is going to move the majority of copyrights out of the headers and into
an AUTHORS file.  This will happen a bit at a time, as we'll be unifying
license headers at the same time.

Additional changes in this patch:
- Make sure files say that they're part of the coreboot project
- Move descriptions below the license header
- Fix some spacing

Signed-off-by: Martin Roth <martin@coreboot.org>
Change-Id: Id5f26a73f0df366651c076a94975bce1fb321b70
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34605
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/arch/arm/armv7/cpu.S

@@ -1,7 +1,5 @@
 /*
- * Optimized assembly for low-level CPU operations on ARMv7 processors.
- *
- * Cache flushing code based off sys/arch/arm/arm/cpufunc_asm_armv7.S in NetBSD
+ * This file is part of the coreboot project.
  *
  * Copyright (c) 2010 Per Odlund <per.odlund@armagedon.se>
  * Copyright (c) 2014 Google Inc.
@@ -28,6 +26,10 @@
  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
+ *
+ * Optimized assembly for low-level CPU operations on ARMv7 processors.
+ *
+ * Cache flushing code based off sys/arch/arm/arm/cpufunc_asm_armv7.S in NetBSD
  */
 
 #include <arch/asm.h>