Add BSPs for Microchip PIC32MZ MCUs

Two boards from Olimex are added:
olimex_hmz144  with PIC32MZ2048EFM144
olimex_emz64.c with PIC32MZ2048EFH064

Both can be programmed with Segger JLINK probe using ICSP
interface. (JTAG not tested but could also work but header
is not mounted).

hw/bsp/pic32mz/family.mk

@@ -0,0 +1,20 @@
+CROSS_COMPILE = xc32-
+CFLAGS_OPTIMIZED = -O2
+LIBS_GCC = -lgcc -lm
+SKIP_NANOLIB = 1
+
+CFLAGS = \
+  -std=c99 \
+  -DCFG_TUSB_MCU=OPT_MCU_PIC32MZ
+
+include $(TOP)/$(BOARD_PATH)/board.mk
+
+SRC_C += \
+	src/portable/microchip/pic32mz/dcd_pic32mz.c \
+
+INC += \
+	$(TOP)/hw/mcu/microchip/pic32mz \
+	$(TOP)/$(BOARD_PATH) \
+
+# flash target using jlink
+flash: flash-jlink