staging:iio:adxrs450: Reflow overlong lines

Reflow two lines to meet the 80 characters per line limit.

Fixes the following checkpatch warnings:
	WARNING: line over 80 characters
	#29: FILE: staging/iio/gyro/adxrs450_core.c:29:
	+ * @reg_address: the address of the lower of the two registers,which should be an even address,

	WARNING: line over 80 characters
	#81: FILE: staging/iio/gyro/adxrs450_core.c:81:
	+ * @reg_address: the address of the lower of the two registers,which should be an even address,

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>