Integrate seco-stm32/stm32-sysfs

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Commit: seco-ne/kernel/modules/seco-stm32@8b7620e0

driver: Some info about stm32 made available through sysfs

- firmware version and chip-id of the stm32 can be read from sysfs
 - in difference to other gpio controlers the stm32 can serve as interrupt-
   controler without having gpios configured

Transferred from seco-ne/kernel/linux-imx-kuk@1afdf002

SRCREV.conf

 SRCREV:pn-linux-seco-imx = "1afdf0025359562eb86798305cad9a31daefc3a8"
 SRCREV:pn-u-boot-seco-imx = "0dc159ad83d7c3676862e2cee6c6a34a7fc96346"
-SRCREV:pn-seco-stm32 = "5435ae24d5c68af13e6eebe328cc9a8df058bf47"
+SRCREV:pn-seco-stm32 = "8b7620e0666ecf66bfef4622db7d62e4f3c4defc"
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