Support for NYX to load from BOOT1/GPP/SD in that order, UMS option to mount whatever volume is selected as boot storage

nyx/Makefile

@@ -41,7 +41,7 @@ OBJS += $(addprefix $(BUILDDIR)/$(TARGET)/, \
 	bm92t36.o bq24193.o max17050.o max7762x.o max77620-rtc.o regulator_5v.o \
 	touch.o joycon.o tmp451.o fan.o \
 	usbd.o xusbd.o usb_descriptors.o usb_gadget_ums.o usb_gadget_hid.o \
-	hw_init.o \
+	hw_init.o boot_storage.o \
 )
 
 # Utilities.