feat(dt-bindings): describe ST GPIO banks and config

Describe GPIO banks configs so that it can be used in
an STM32MP device-tree file.

Signed-off-by: Pascal Paillet <p.paillet@st.com>
Change-Id: I

feat(dt-bindings): describe ST GPIO banks and config

Describe GPIO banks configs so that it can be used in
an STM32MP device-tree file.

Signed-off-by: Pascal Paillet <p.paillet@st.com>
Change-Id: If5dd05aae314cbb3189eb02c9fe555b832ac2bdb

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