ARM: dts: stm32: add can1 sleep pins muxing on stm32mp157c-ev1 board

Add pinctrl sleep state for can1 on stm32mp157c-ev1.
Signed-off-by: Bich Hemon <bich.hemon@st.com>
Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>

arch/arm/boot/dts/stm32mp157c-ev1.dts

@@ -124,8 +124,9 @@ ltdc_ep0_out: endpoint@0 {
 };
 
 &m_can1 {
-	pinctrl-names = "default";
+	pinctrl-names = "default", "sleep";
 	pinctrl-0 = <&m_can1_pins_a>;
+	pinctrl-1 = <&m_can1_sleep_pins_a>;
 	status = "okay";
 };