onclite: Rename msm_irqbalance_sdm632.conf to msm_irqbalance_little_big.conf

In order to runtime change msm irqbalance conf file,
need to use exist vendor.msm_irqbal_lb service which
is using msm_irqbalance_little_big.conf file.

Change-Id: I38e290e2f9c2f3df0fc891c96ea9eb2cc56acd05