tools/mkimage: update to 2021.10

Changelog:

 - upstream now needs OpenSSL in order to be able to sign FITs. See:
commit cb9faa6f98ae ("tools: Use a single target-independent config to enable OpenSSL")

 - removes upstream patches.

Link: cb9faa6f98
Tested-by: Sergey V. Lobanov <sergey@lobanov.in>
Signed-off-by: Huangbin Zhan <zhanhb88@gmail.com>
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>

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

@@ -15,11 +15,9 @@ __u64 is not available on FreeBSD, remove its usage.
 Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
 ---
  include/image.h             | 2 ++
- include/imx8image.h         | 5 +++++
  include/linux/posix_types.h | 2 ++
  include/linux/types.h       | 4 +++-
- lib/rsa/rsa-sign.c          | 2 +-
- 5 files changed, 13 insertions(+), 2 deletions(-)
+ 3 files changed, 7 insertions(+), 1 deletion(-)
 
 --- a/include/image.h
 +++ b/include/image.h