hwdef: update SIYI_N7 hwdef

the N7 isn't the same as the Durandal. It has 1 CAN bus, and 2 less
UARTs, and an extra compass. This fixes the hwdef.dat to match the
schematic

libraries/AP_HAL_ChibiOS/hwdef/SIYI_N7/hwdef-bl.dat

@@ -1,8 +1,46 @@
-include ../Durandal/hwdef-bl.dat
+# hw definition file for processing by chibios_hwdef.py
+# for H743 bootloader
+
+# MCU class and specific type
+MCU STM32H7xx STM32H743xx
 
 # board ID for firmware load
 APJ_BOARD_ID 1123
 
-undef USB_VENDOR
-undef USB_PRODUCT
-undef USB_STRING_MANUFACTURER
+# crystal frequency
+OSCILLATOR_HZ 16000000
+
+FLASH_SIZE_KB 2048
+
+# bootloader is installed at zero offset
+FLASH_RESERVE_START_KB 0
+
+FLASH_BOOTLOADER_LOAD_KB 128
+
+PB1 LED_RED OUTPUT LOW # red
+PC6 LED_ACTIVITY OUTPUT LOW # green
+PC7 LED_BOOTLOADER OUTPUT LOW # blue
+define HAL_LED_ON 0
+
+# order of UARTs (and USB)
+SERIAL_ORDER OTG1 UART7
+
+# UART7 is debug
+PF6 UART7_RX UART7 NODMA
+PE8 UART7_TX UART7 NODMA
+
+PA11 OTG_FS_DM OTG1
+PA12 OTG_FS_DP OTG1
+
+PA13 JTMS-SWDIO SWD
+PA14 JTCK-SWCLK SWD
+
+# pullup buzzer for no sound in bootloader
+PE5 BUZZER OUTPUT LOW PULLDOWN
+
+# Add CS pins to ensure they are high in bootloader
+PF10 MS5611_CS CS
+PF2  ICM20689_CS CS
+PF4  BMI055_G_CS CS
+PG10 BMI055_A_CS CS
+PF5  FRAM_CS CS SPEED_VERYLOW