power: supply: qcom: Fix SMB5 and QG IIO device names

Fix SMB5 and QG IIO device names in driver files instead of
obtaining them from DT node names.

Change-Id: I9a8188e94f5ed714b15384fd4dbb59f21d2a5c59
Signed-off-by: Jishnu Prakash <jprakash@codeaurora.org>