Use more secure HTTPS URLs for coreboot sites

The coreboot sites support HTTPS, and requests over HTTP with SSL are
also redirected. So use the more secure URLs, which also saves a
request most of the times, as nothing needs to be redirected.

Run the command below to replace all occurences.

```
$ git grep -l -E 'http://(www.|review.|)coreboot.org'
| xargs sed -i 's,http://\(.*\)coreboot.org,https://\1coreboot.org,g'
```

Change-Id: If53f8b66f1ac72fb1a38fa392b26eade9963c369
Signed-off-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-on: https://review.coreboot.org/20034
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

MAINTAINERS

@@ -35,7 +35,7 @@ trivial patch so apply some common sense.
 
 	PLEASE check your patch with the automated style checker
 	(util/lint/checkpatch.pl) to catch trival style violations.
-	See http://coreboot.org/Coding_Style for guidance here.
+	See https://coreboot.org/Coding_Style for guidance here.
 
 	PLEASE add the maintainers that are generated by
 	util/scripts/get_maintainer.pl as reviewers.  The results returned
@@ -54,7 +54,7 @@ trivial patch so apply some common sense.
 	of the OSDL certificate of contribution and should include a
 	Signed-off-by: line.  The current version of this "Developer's
 	Certificate of Origin" (DCO) is listed at
-	http://coreboot.org/Development_Guidelines#Sign-off_Procedure.
+	https://coreboot.org/Development_Guidelines#Sign-off_Procedure.
 
 6.	Make sure you have the right to send any changes you make. If you
 	do changes at work you may find your employer owns the patch
@@ -517,7 +517,7 @@ MISSING: SPI
 
 THE REST
 M:	Stefan Reinauer <stefan.reinauer@coreboot.org>
-T:	git http://review.coreboot.org/coreboot
+T:	git https://review.coreboot.org/coreboot
 S:	Buried alive in mainboards
 F:	*
 F:	*/