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>

payloads/libpayload/README

@@ -8,13 +8,13 @@ code, and provides common C library symbols such as malloc() and printf().
 
 Note: This is _not_ a standard library for use with an operating system,
 rather it's only useful for coreboot payload development!
-See http://coreboot.org for details on coreboot.
+See https://coreboot.org for details on coreboot.
 
 
 Installation
 ------------
 
- $ git clone http://review.coreboot.org/p/coreboot.git
+ $ git clone https://review.coreboot.org/p/coreboot.git
 
  $ cd coreboot/payloads/libpayload
 
@@ -52,10 +52,10 @@ Please see the sample/ directory for details.
 Website and Mailing List
 ------------------------
 
-The main website is http://www.coreboot.org/Libpayload.
+The main website is https://www.coreboot.org/Libpayload.
 
 For additional information, patches, and discussions, please join the
-coreboot mailing list at http://coreboot.org/Mailinglist, where most
+coreboot mailing list at https://coreboot.org/Mailinglist, where most
 libpayload developers are subscribed.
 
 

payloads/libpayload/arch/x86/exec.S

@@ -30,7 +30,7 @@
 /* calling syntax:  i386_do_exec(long addr, int argc, char **argv, int *ret) */
 
 /* This implements the payload API detailed here:
- * http://www.coreboot.org/Payload_API
+ * https://www.coreboot.org/Payload_API
  */
 
 .align 4

payloads/libpayload/arch/x86/head.S

@@ -74,7 +74,7 @@ _init:
 	movl %ebx, loader_ebx
 
 	/* Copy argv[] and argc as demanded by the Payload API,
-	 * see http://www.coreboot.org/Payload_API and exec.S.
+	 * see https://www.coreboot.org/Payload_API and exec.S.
 	 */
 	cmpl $CB_MAGIC_VALUE, CB_MAGIC(%esp)
 	jne 1f