firmware: stm32: add missing irq handler for i2c2

Change-Id: I51659641ed0bdd5d6bf9a6f263e31723f45c51f6
Signed-off-by: Antonio Borneo <antonio.borneo@st.com>
diff --git a/firmware/os/platform/stm32/i2c.c b/firmware/os/platform/stm32/i2c.c
index 9abedc6..b15829a 100644
--- a/firmware/os/platform/stm32/i2c.c
+++ b/firmware/os/platform/stm32/i2c.c
@@ -761,6 +761,7 @@
     }
 
 DECLARE_IRQ_HANDLERS(1);
+DECLARE_IRQ_HANDLERS(2);
 DECLARE_IRQ_HANDLERS(3);
 
 static inline struct Gpio* stmI2cGpioInit(const struct StmI2cBoardCfg *board, const struct StmI2cGpioCfg *cfg)