stm32g4: irq.json: use fdcanX_itY consistently

Other families used fdcanX_itY already, and that matches the terminology
of the reference manual, so move to that style for consistency.

Signed-off-by: Karl Palsson <karlp@tweak.au>

include/libopencm3/stm32/g4/irq.json

@@ -21,8 +21,8 @@
         "adc12",
         "usb_hp",
         "usb_lp",
-        "fdcan1_intr0",
-        "fdcan1_intr1",
+        "fdcan1_it0",
+        "fdcan1_it1",
         "exti9_5",
         "tim1_brk_tim15",
         "tim1_up_tim16",
@@ -86,10 +86,10 @@
         "i2c4_er",
         "spi4",
         "aes",
-        "fdcan2_intr0",
-        "fdcan2_intr1",
-        "fdcan3_intr0",
-        "fdcan3_intr1",
+        "fdcan2_it0",
+        "fdcan2_it1",
+        "fdcan3_it0",
+        "fdcan3_it1",
         "rng",
         "lpuart",
         "i2c3_ev",