Squashed merge of the following:
Author: Gregory Nutt <gnutt@nuttx.org>
drivers/sensors: Fix some minor typos in last commit that cause some compile problems.
drivers/sensors/: Clean up some coding standard isses in LM330 and ADXL372 drivers.
drivers/sensors/README.txt: Clean up some long lines and odd line breaks.
include/nuttx/sensors: Completes coding style review of adxl372.h, cluster_driver.h, and lsm330.h.
Author: Bob Feretich <bob.feretich@rafresearch.com>
Add LSM330 SPI and ADXL372 drivers along with the cluster driver infrastructure.
