Fix spelling of ARM Cortex

It's Cortex-Xn, not Cortex Xn or cortex xn or cortex-xn or CORTEX-Xn
or CortexXn. Further it's Cortex-M0+, not M0plus.

Cf. http://www.arm.com/products/processors/index.php

Consistently write it the official way, so that it stops propagating.
Originally spotted in the documentation, it mainly affects code comments
but also Atmel SAM3/SAM4/SAMV, NiietCM4 and SiM3x flash driver output.

Found via:

  git grep -i "Cortex "
  git grep -i "Cortex-" | grep -v "Cortex-" | grep -v ".cpu"
  git grep -i "CortexM"

Change-Id: Ic7b6ca85253e027f6f0f751c628d1a2a391fe914
Signed-off-by: Andreas Färber <afaerber@suse.de>
Reviewed-on: http://openocd.zylin.com/3483
Tested-by: jenkins
Reviewed-by: Marc Schink <openocd-dev@marcschink.de>
Reviewed-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>

src/flash/nor/at91sam4.c

@@ -1407,11 +1407,11 @@ static const char *const eproc_names[] = {
 	_unknown,					/* 0 */
 	"arm946es",					/* 1 */
 	"arm7tdmi",					/* 2 */
-	"cortex-m3",				/* 3 */
+	"Cortex-M3",				/* 3 */
 	"arm920t",					/* 4 */
 	"arm926ejs",				/* 5 */
-	"cortex-a5",				/* 6 */
-	"cortex-m4",				/* 7 */
+	"Cortex-A5",				/* 6 */
+	"Cortex-M4",				/* 7 */
 	_unknown,					/* 8 */
 	_unknown,					/* 9 */
 	_unknown,					/* 10 */