dt-bindings: Add summit vendor id

Add vendor id for Summit microelectronics
for SMB347 charger.

Cc: John Stultz <john.stultz@linaro.org>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Signed-off-by: Jonghwa Lee <jonghwa3.lee@samsung.com>
Cc: Chanwoo Choi <cw00.choi@samsung.com>
Cc: Myungjoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Vinay Simha BN <simhavcs@gmail.com>
Signed-off-by: Rob Herring <robh@kernel.org>