[sdmmc] Fix Sandisk U1 fast power cycle

Some Sandisk U1 sd cards do not behave nicely if they power cycle too fast. A min 100ms wait, is enough to mitigate that.

Fortunately, because of how the code paths are structured, this was never hit.

bootloader/config/config.h

@@ -35,6 +35,7 @@ typedef struct _hekate_config
 	u32 errors;
 	int sept_run;
 	bool rcm_patched;
+	u32 sd_timeoff;
 } hekate_config;
 
 typedef enum