Add ble connection interval support

Signed-off-by: Luigi311 <luigi311.lg@gmail.com>

app/Kconfig

@@ -142,6 +142,30 @@ config ZMK_BLE_PASSKEY_ENTRY
 	bool "Experimental: Requiring typing passkey from host to pair BLE connection"
 	default n
 
+config BT_GAP_AUTO_UPDATE_CONN_PARAMS
+	bool "Automatic Update of Connection Parameters"
+	default y
+
+config BT_GAP_PERIPHERAL_PREF_PARAMS
+	bool "Configure peripheral preferred connection parameters"
+	default y
+
+config BT_PERIPHERAL_PREF_MIN_INT
+	int "Peripheral preferred minimum connection interval in 1.25ms units"
+	default 6
+
+config BT_PERIPHERAL_PREF_MAX_INT
+	int "Peripheral preferred maximum connection interval in 1.25ms units"
+	default 12
+
+config BT_PERIPHERAL_PREF_SLAVE_LATENCY
+	int "Peripheral preferred slave latency in Connection Intervals"
+	default 30
+
+config BT_PERIPHERAL_PREF_TIMEOUT
+	int "Peripheral preferred supervision timeout in 10ms units"
+	default 400
+
 #ZMK_BLE
 endif
 
@@ -211,9 +235,6 @@ config BT_MAX_PAIRED
 config BT_MAX_CONN
 	default 1
 
-config BT_GAP_AUTO_UPDATE_CONN_PARAMS
-	default n
-
 #!ZMK_SPLIT_BLE_ROLE_CENTRAL
 endif