ARM: dts: msm: Modify SMB1390 and SMB1355 device specification

Define SMB1390 and SMB1355 device specification independent of
I2C parent. Add child node SMB1390/SMB1355 to respective I2C
parent within the respective msm target definition.

Change-Id: I045a0496a29600225cdb9d2f5390994991029d97
Signed-off-by: Umang Agrawal <uagrawal@codeaurora.org>