tools: mkimage: Update U-Boot to version 2021.01

* The fit image is now created with 0666 permission in upstream U-Boot
  remove our patch switch creates it with 0744
* The generated/autoconf.h file is created now as an empty file, it is
  not needed to remove this include any more.
* Upstream lib/rsa/rsa-sign.c now includes stdlib.h instead of malloc.h
* ALIGN_MASK was moved to imagetool.h, own patch should not be needed
  any more.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

tools/mkimage/patches/050-Add-compatibility-with-non-Linux-hosts.patch

@@ -12,8 +12,6 @@ parts for these header files manually or remove the usage too.
 
 __u64 is not available on FreeBSD, remove its usage.
 
-<malloc.h> has been replaced by <stdlib.h>
-
 Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
 ---
  include/image.h             | 2 ++
@@ -35,21 +33,6 @@ Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
  #include <stdbool.h>
  
  /* Define this to avoid #ifdefs later on */
---- a/include/imx8image.h
-+++ b/include/imx8image.h
-@@ -11,7 +11,12 @@
- #include <image.h>
- #include <inttypes.h>
- #include "imagetool.h"
-+#ifdef linux
- #include "linux/kernel.h"
-+#else
-+#define ALIGN(x,a)		__ALIGN_MASK((x),(typeof(x))(a)-1)
-+#define __ALIGN_MASK(x,mask)	(((x)+(mask))&~(mask))
-+#endif
- 
- #define __packed   __attribute__((packed))
- 
 --- a/include/linux/posix_types.h
 +++ b/include/linux/posix_types.h
 @@ -43,6 +43,8 @@ typedef void (*__kernel_sighandler_t)(in
@@ -82,14 +65,3 @@ Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
  typedef __u64 __bitwise __le64;
  typedef __u64 __bitwise __be64;
  #endif
---- a/lib/rsa/rsa-sign.c
-+++ b/lib/rsa/rsa-sign.c
-@@ -4,7 +4,7 @@
-  */
- 
- #include "mkimage.h"
--#include <malloc.h>
-+#include <stdlib.h>
- #include <stdio.h>
- #include <string.h>
- #include <image.h>