sdmmc v2: Add full SD card fallback initialization

hekate main always runs in compatibility mode (SDR82).
This ensures speed on boot process.

Nyx will first try SDR104.
If the sd card is a sandisk U1 and fails, it will try the compatibility mode.
After that it fallbacks to lower bus speeds.

Both support 1bit mode for broken sd card readers.

Having the new error checking in the sdmmc driver, allows for all that to work.
It can now fail instead of continuing, like how HOS reacts.

bootloader/storage/sdmmc.c

@@ -18,6 +18,7 @@
 #include <string.h>
 #include "sdmmc.h"
 #include "mmc.h"
+#include "nx_sd.h"
 #include "sd.h"
 #include "../../common/memory_map.h"
 #include "../gfx/gfx.h"
@@ -172,25 +173,42 @@ int sdmmc_storage_end(sdmmc_storage_t *storage)
 static int _sdmmc_storage_readwrite(sdmmc_storage_t *storage, u32 sector, u32 num_sectors, void *buf, u32 is_write)
 {
 	u8 *bbuf = (u8 *)buf;
-
+	bool first_reinit = false;
 	while (num_sectors)
 	{
 		u32 blkcnt = 0;
-		//Retry 9 times on error.
-		u32 retries = 10;
+		// Retry 5 times if failed.
+		u32 retries = 5;
 		do
 		{
+reinit_try:
 			if (_sdmmc_storage_readwrite_ex(storage, &blkcnt, sector, MIN(num_sectors, 0xFFFF), bbuf, is_write))
 				goto out;
 			else
 				retries--;
 
-			msleep(100);
+			msleep(50);
 		} while (retries);
 
+		// Disk IO failure! Reinit SD Card to a lower speed.
+		if (storage->sdmmc->id == SDMMC_1)
+		{
+			int res;
+			if (!first_reinit)
+				res = sd_initialize(true);
+			else
+				res = sd_init_retry(true);
+
+			retries = 3;
+			first_reinit = true;
+
+			if (res)
+				goto reinit_try;
+		}
+
 		return 0;
 
-out:;
+out:
 DPRINTF("readwrite: %08X\n", blkcnt);
 		sector += blkcnt;
 		num_sectors -= blkcnt;