examples/sensorbd_demo: fix spi example
examples/sensorbd_demo: fix spi example

Fix spi examples on sensor board.

Change-Id: I6d89f63ab9975e3b208ffab86e883c929b115a54
Signed-off-by: Junhwan Park <7fee488b6f78fc50b291ffc7d10428788977e877@samsung.com>

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