boards: use zephyr_i2c instead of grove_i2c

These are equivalent and there's adapters on the market, having a single
label allows using it shields with any other board with connectorized
i2c busses.

Signed-off-by: Fabio Baltieri <fabiobaltieri@google.com>

boards/m5stack/m5stack_atom_lite/grove_connectors.dtsi

@@ -15,4 +15,4 @@
 	};
 };
 
-grove_i2c1: &i2c1 {};
+zephyr_i2c: &i2c1 {};

boards/m5stack/m5stack_atoms3/grove_connectors.dtsi

@@ -14,4 +14,4 @@
 	};
 };
 
-grove_i2c1: &i2c1 {};
+zephyr_i2c: &i2c1 {};

boards/m5stack/m5stack_atoms3_lite/grove_connectors.dtsi

@@ -15,4 +15,4 @@
 	};
 };
 
-grove_i2c1: &i2c1 {};
+zephyr_i2c: &i2c1 {};

boards/m5stack/m5stack_core2/grove_connectors.dtsi

@@ -15,5 +15,5 @@
 	};
 };
 
-grove_i2c: &i2c1 {};
+zephyr_i2c: &i2c1 {};
 grove_uart: &uart1 {};

boards/m5stack/m5stack_cores3/grove_connectors.dtsi

@@ -14,5 +14,5 @@
 	};
 };
 
-grove_i2c: &i2c1 {};
+zephyr_i2c: &i2c1 {};
 grove_uart: &uart2 {};

boards/seeed/lora_e5_dev_board/lora_e5_dev_board.dts

@@ -168,7 +168,7 @@ stm32_lp_tick_source: &lptim1 {
 
 /* connectors: */
 grove_serial: &usart1 {};
-grove_i2c: &i2c2 {};
+zephyr_i2c: &i2c2 {};
 
 &flash0 {
 	partitions {

boards/seeed/wio_terminal/grove_connectors.dtsi

@@ -22,4 +22,4 @@
 	};
 };
 
-grove_i2c1: &sercom3 {};
+zephyr_i2c: &sercom3 {};