Hotfix:STM32 and STM32F7 Fixes the bkp reference counter issue #6553
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@LorenzMeier
This is a hotfix that I have upstreamed. It is for code on all STM32 that used a static reference count on the bkp registers write protect before it was initialized.
See https://groups.yahoo.com/neo/groups/nuttx/conversations/topics/14362
The F7 did not have the same startup ordering issue - but it is fixed as well