hall_sensor: Add hall sensor driver

Bug: 199568923
Test: Compile pass. Hall sensor driver is loaded.
Signed-off-by: Rick Chen <rickctchen@google.com>
Change-Id: Ief3426a6bb5b0faeb59a30f8b85f2e1c8bfeddfe
3 files changed
tree: 3196b460d9570fcdf81b8b815d5298444bc2fa50
  1. hall_sensor.c
  2. Kconfig
  3. Makefile