ARM: dts: qcom: Add iio channels nodes for smb358 charger driver

Add vbat_sns and bat_id iio channels for smb358 charger
driver to align with the requirement as per 4.14 kernel
for MDM9607.

Change-Id: I1f61b034eeb74ab91352b410484999f2068d0a4b
Signed-off-by: Savitri Balagani <savitri@codeaurora.org>
Signed-off-by: Sivasri Kumar Vanka <sivasri@codeaurora.org>