nyx: bpmp: automatically find best clock for t210

There were 4 reports of Nyx hanging or UMS and backup verification failing because of low binned Erista SoC.

This change reduces clock for hekate main and Nyx will now automatically try and find a working one.
In case Nyx hangs it will reduce it on next inject.

If Nyx works and user still has issues with UMS/Verification, manually editing nyx.ini and setting `bpmpclock=2` will fix that.

nyx/nyx_gui/storage/nx_sd.c

@@ -65,6 +65,11 @@ bool sd_get_card_initialized()
 	return sd_init_done;
 }
 
+bool sd_get_card_mounted()
+{
+	return sd_mounted;
+}
+
 u32 sd_get_mode()
 {
 	return sd_mode;
@@ -197,6 +202,11 @@ static void _sd_deinit(bool deinit)
 void sd_unmount() { _sd_deinit(false); }
 void sd_end()     { _sd_deinit(true); }
 
+bool sd_is_gpt()
+{
+	return sd_fs.part_type;
+}
+
 void *sd_file_read(const char *path, u32 *fsize)
 {
 	FIL fp;