powerpc: dts: mpc8315erdb: Add missing #cells properties to SPI bus

These properties are required by the spi-controller binding.

Signed-off-by: J. Neuschäfer <j.ne@posteo.net>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20260303-mpc83xx-cleanup-v2-4-187d3a13effa@posteo.net

Author: neuschaefer

arch/powerpc/boot/dts/mpc8315erdb.dts

@@ -135,6 +135,8 @@
 			reg = <0x7000 0x1000>;
 			interrupts = <16 IRQ_TYPE_LEVEL_LOW>;
 			interrupt-parent = <&ipic>;
+			#address-cells = <1>;
+			#size-cells = <0>;
 			mode = "cpu";
 		};