Merge pull request #6712 from aabadie/driver_vcnl4010

drivers/Makefile.dep

drivers/Makefile.include

drivers/include/saul.h

drivers/include/vcnl40x0.h

drivers/saul/saul_str.c

drivers/vcnl40x0/Makefile

drivers/vcnl40x0/include/vcnl40x0_internals.h

drivers/vcnl40x0/include/vcnl40x0_params.h

drivers/vcnl40x0/vcnl40x0.c

drivers/vcnl40x0/vcnl40x0_saul.c

makefiles/pseudomodules.inc.mk

sys/auto_init/auto_init.c

sys/auto_init/saul/auto_init_vcnl40x0.c

sys/include/phydat.h

sys/phydat/phydat_str.c

tests/driver_vcnl40x0/Makefile

tests/driver_vcnl40x0/README.md

tests/driver_vcnl40x0/main.c