power: qpnp-fg: Fix general coding style issues

Fix the general coding style issues reported by the
checkpatch tool.

Change-Id: I61e99f6ec9873478fe53a0fb409fe5972a907534
Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>
Signed-off-by: Shilpa Suresh <sbsure@codeaurora.org>