Add Raspberry Pi Zero W and Zero 2 W

These are different Broadcom chips. The peripherals are essentially
the same. The main differences are:
* The CPU(s)
* The interrupt controller
* The peripheral base address (but not the peripherals that we use)

src/device/dcd_attr.h

@@ -190,7 +190,7 @@
   #define DCD_ATTR_ENDPOINT_MAX   4
 
 //------------- Broadcom -------------//
-#elif TU_CHECK_MCU(OPT_MCU_BCM2711)
+#elif TU_CHECK_MCU(OPT_MCU_BCM2711, OPT_MCU_BCM2835, OPT_MCU_BCM2837)
   #define DCD_ATTR_ENDPOINT_MAX   8
 
 //------------- Broadcom -------------//