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19943: cpu/stm32: FMC used for low-level LCD parallel interface r=maribu a=gschorcht ### Contribution description This PR provides the implementation of the LCD low-level MCU 8080 parallel interface using the FMC peripheral. ### Testing procedure ``` BOARD=stm32f723e-disco make -C tests/drivers/st77xx flash ``` and ``` BOARD=stm32l496g-disco make -C tests/drivers/st77xx flash ``` should work on top of PR #19941. Drawing operations should be much faster. ### Issues/PRs references Depends on PR #19941 19978: treewide: fix typos to make codespell happy r=maribu a=maribu ### Contribution description - fixes typos in comments and docs (no generated firmware changes expected) - fixes a typo in a string in a GUI of a utility program - add some false positives to the ignore list ### Testing procedure - No generated binaries (except for the GUI version of the utility program to flash the MSB-A2) should change - The diff should not look too scary ### Issues/PRs references None Co-authored-by: Gunar Schorcht <gunar@schorcht.net> Co-authored-by: Marian Buschsieweke <marian.buschsieweke@posteo.net>