change broadcom submodule path from git to http

.gitmodules

@@ -129,5 +129,4 @@
 	url = https://github.com/hathach/mm32sdk.git
 [submodule "hw/mcu/broadcom"]
 	path = hw/mcu/broadcom
-	url = git@github.com:adafruit/broadcom-peripherals.git
-	branch = main-build
+	url = https://github.com/adafruit/broadcom-peripherals.git

hw/bsp/raspberrypi4/family.mk

@@ -43,5 +43,7 @@ SRC_S += $(MCU_DIR)/broadcom/boot.S
 $(BUILD)/kernel8.img: $(BUILD)/$(PROJECT).elf
 	$(OBJCOPY) -O binary $^ $@
 
+# Copy to kernel to netboot drive or SD card
+# Change destinaation to fit your need
 flash: $(BUILD)/kernel8.img
 	@$(CP) $< /home/$(USER)/Documents/code/pi4_tinyusb/boot_cpy