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
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