ARM: dts: stm32: fix etzpc id for i2s4 node on stm32mp13

Replace ETZPC id 13 (STM32MP1_ETZPC_STGENC_ID) in I2S4 node by
id 18 (STM32MP1_ETZPC_SPI4_ID).

Change-Id: Ic8207ed995f4749f910bb5d34cd7a6f326298b0f
Signed-off-by: Olivier Moysan <olivier.moysan@foss.st.com>
Reviewed-on: https://gerrit.st.com/c/mpu/oe/st/u-boot/+/557851
ACI: CITOOLS <MDG-smet-aci-reviews@list.st.com>
Domain-Review: Arnaud POULIQUEN <arnaud.pouliquen@st.com>
ACI: CIBUILD <MDG-smet-aci-builds@list.st.com>
Reviewed-by: Patrice CHOTARD <patrice.chotard@foss.st.com>

Author: Olivier Moysan

arch/arm/dts/stm32mp131.dtsi

@@ -1470,7 +1470,7 @@
 				dmas = <&dmamux1 83 0x400 0x01>,
 				       <&dmamux1 84 0x400 0x01>;
 				dma-names = "rx", "tx";
-				access-controllers = <&etzpc 13>;
+				access-controllers = <&etzpc 18>;
 				status = "disabled";
 			};