ble_mesh: Move TAG definition to each example

Move the TAG definition of each example to the corresponding
source file (previously it is defined in the common example
intialization header file), which can avoid the redefinition
of TAG in some situations.

examples/bluetooth/esp_ble_mesh/ble_mesh_node/onoff_client/main/main.c

@@ -23,6 +23,8 @@
 #include "ble_mesh_example_init.h"
 #include "ble_mesh_example_nvs.h"
 
+#define TAG "EXAMPLE"
+
 #define CID_ESP 0x02E5
 
 static uint8_t dev_uuid[16] = { 0xdd, 0xdd };

examples/bluetooth/esp_ble_mesh/ble_mesh_node/onoff_server/main/main.c

@@ -24,6 +24,8 @@
 #include "board.h"
 #include "ble_mesh_example_init.h"
 
+#define TAG "EXAMPLE"
+
 #define CID_ESP 0x02E5
 
 extern struct _led_state led_state[3];