AP_HAL_ChibiOS: Add on-board baro support to iFlight BeastH7 V2 target.

iFlight's own website says that there is no barometer on this device,
however on my one there is a DPS310 connected on I2C.  This PR adds
support for the on-board baro but leaves it as optional.

libraries/AP_HAL_ChibiOS/hwdef/BeastH7v2/README.md

@@ -9,8 +9,8 @@ The Beast H7 AIO is a flight controller produced by [iFlight](https://shop.iflig
  - MCU: BGA-STM32H743
  - Gyro: BMI270
  - 16Mb Onboard Flash
- - BEC output: 5V 2.5A 
- - No Barometer
+ - BEC output: 5V 2.5A
+ - Barometer: DPS310 or None
  - OSD: AT7456E
  - 5 UARTS: (UART1, UART2, UART3, UART4, UART7)
  - I2C for external compass. UART3 pins are used for I2C (BRD_ALT_CONFIG=1)
@@ -36,9 +36,9 @@ receive pin for UARTn. The Tn pin is the transmit pin for UARTn.
 All UARTS support DMA.
 
 ## RC Input
- 
+
 RC input is configured on the (UART2_RX/UART2_TX) pins which forms part of the DJI connector. It supports all RC protocols.
-  
+
 ## OSD Support
 
 The Beast H7 v2 AIO supports OSD using OSD_TYPE 1 (MAX7456 driver).

libraries/AP_HAL_ChibiOS/hwdef/BeastH7v2/hwdef.dat

@@ -20,8 +20,8 @@ APJ_BOARD_ID 1056
 PB4 TIM3_CH1 TIM3 PWM(2) GPIO(51) BIDIR   # 2
 PB5 TIM3_CH2 TIM3 PWM(3) GPIO(52)         # 3
 
-# only one I2C bus
-I2C_ORDER I2C2
+I2C_ORDER I2C1 I2C2
+define HAL_I2C_INTERNAL_MASK 0
 
 # order of UARTs (and USB)
 SERIAL_ORDER OTG1 USART1 USART2 USART3 UART4 EMPTY EMPTY UART7
@@ -42,6 +42,10 @@ define HAL_SERIAL2_PROTOCOL SerialProtocol_RCIN
 PB11 USART3_RX USART3
 PB10 USART3_TX USART3
 
+# I2C1 for baro
+PB8 I2C1_SCL I2C1 PULLUP
+PB9 I2C1_SDA I2C1 PULLUP
+
 # I2C2 for compass. These pins can also be used as USART3
 PB10 I2C2_SCL I2C2 ALT(1)
 PB11 I2C2_SDA I2C2 ALT(1)
@@ -55,5 +59,6 @@ define HAL_PROBE_EXTERNAL_I2C_COMPASSES
 # one IMU
 IMU BMI270 SPI:bmi270 ROTATION_ROLL_180_YAW_225
 
-# v2 has no BARO
+# Some boards have no baro, some have a DPS310 Baro on I2C1
 define HAL_BARO_ALLOW_INIT_NO_BARO 1
+BARO DPS310 I2C:0:0x76