Integrate uboot-imx-kuk/add-mx6-pfid-detection

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Commit: seco-ne/3rd-party/kuk/uboot-imx-kuk@e21629ff



board:seco-mx6: fix implicit declaration of function imx_ddr_size

During initial board preparation sys_proto.h was lost.
This will fix following warning during compilation:

board/keithkoep/seco_mx6/seco_mx6.c: In function ‘dram_init’:
board/keithkoep/seco_mx6/seco_mx6.c:45:24: warning: implicit declaration of function ‘imx_ddr_size’ [-Wimplicit-function-declaration]
   45 |         gd->ram_size = imx_ddr_size();

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

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Commit: seco-ne/3rd-party/kuk/uboot-imx-kuk@a3f1ef3b



board:seco_mx6: set version information to env

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

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Commit: seco-ne/3rd-party/kuk/uboot-imx-kuk@727f256e



board:common:baseboard_pfids: add handling for mx6 san boards

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

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Commit: seco-ne/3rd-party/kuk/uboot-imx-kuk@fbb1da6f



board:common:baseboard: add mx6 boards to board_info and baseboard_type

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

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Commit: seco-ne/3rd-party/kuk/uboot-imx-kuk@47a0f5cd



seco-mx6_defconfig: enable CONFIG_VERSION_VARIABLE

It was enabled for other boards.

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