ARM: dts: msm: Change recharge threshold source for PMI8994

Set the recharge threshold source as fuel gauge ADC for PMI8994
instead of the default analog sensor. Since we're changing it
based on FG, configure soc threshold for FG and remove it for
smbcharger.

CRs-Fixed: 723434
Change-Id: I7040fe73a045a5e798f45d21cd63ff3a688b0e61
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>