Add common code for reading boards configuration from fuses

Some of SECO  boards use fuses to provide information about hardware
configuration (e.g. enabled optional features) to software.

The code in this commit was taken and adapted from SECO-NE repo:
https://git.seco.com/seco-ne/3rd-party/kuk/uboot-imx-kuk.git
branch: guf_imx_v2020.04-trizeps8plus_2021_12_07
files:
  uboot-imx-kuk/board/keithkoep/common/kuk_boards.c
  uboot-imx-kuk/board/keithkoep/common/kuk_boards.h

In the initial version of this commit, kuk/KUK from Keith und Koep had been
preserved.
But according to the latest decision from
!152 (comment 457197)

,
it was decided to get rid of these legacy labels.
So, except for back-porting fuse logic, a following renaming of routines
and files has been done:
kuk_boards.x -> seco_fuse.x
KUK_xxx -> SECO_FUSE_xxx
kuk_xxx -> seco_fuse_xxx

Signed-off-by: Mikhail Vanyulin <mikhail.vanyulin@rtsoft.de>