[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/storage/sdmmc_driver.c

@@ -19,6 +19,7 @@
 
 #include "mmc.h"
 #include "sdmmc.h"
+#include "../config/config.h"
 #include "../gfx/gfx.h"
 #include "../power/max7762x.h"
 #include "../soc/clock.h"
@@ -31,6 +32,8 @@
 //#define DPRINTF(...) gfx_printf(__VA_ARGS__)
 #define DPRINTF(...)
 
+extern hekate_config h_cfg;
+
 /*! SCMMC controller base addresses. */
 static const u32 _sdmmc_bases[4] = {
 	0x700B0000,
@@ -1037,6 +1040,7 @@ void sdmmc_end(sdmmc_t *sdmmc)
 		{
 			gpio_output_enable(GPIO_PORT_E, GPIO_PIN_4, GPIO_OUTPUT_DISABLE);
 			max77620_regulator_enable(REGULATOR_LDO2, 0);
+			h_cfg.sd_timeoff = get_tmr_ms(); // Some sandisc U1 cards need 100ms for a power cycle.
 			msleep(1); // To power cycle min 1ms without power is needed.
 		}