fix: check if the symbol is defined before redefining it #7620
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Fixes #7614
Like explained here: #7614 (comment)
The line
#define LV_FS_DEFAULT_DRIVE_LETTER LV_FS_DEFAULT_DRIVER_LETTERis causing the docs generation workflow to crash when building the examples because of a symbol redefinition. This checks if the symbol is already defined to avoid redefining it