qpnp-fg-gen3: use IMA single mode for pm660 fuel gauge

Because of HW issues, burst mode access cannot be done with
pm660 parts. Use IMA in single mode for it.

Change-Id: I4e86601d713140e559ba8a6f92715f2075c7b8ee
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>