Add indication of how errata RP2040-E5 workarund is turned on (#210)

Author: kilograham

usb/device/dev_hid_composite/CMakeLists.txt

@@ -15,6 +15,9 @@ target_include_directories(dev_hid_composite PUBLIC
 # for TinyUSB device support and tinyusb_board for the additional board support library used by the example
 target_link_libraries(dev_hid_composite PUBLIC pico_stdlib tinyusb_device tinyusb_board)
 
+# Uncomment this line to enable fix for Errata RP2040-E5 (the fix requires use of GPIO 15)
+#target_compile_definitions(dev_hid_composite PUBLIC PICO_RP2040_USB_DEVICE_ENUMERATION_FIX=1)
+
 pico_add_extra_outputs(dev_hid_composite)
 
 # add url via pico_set_program_url