defconfig: msm8994: enable correct charger driver

MSM8994 ships with the qpnp-smbcharger chip in the PMI8994, and the
SMB1357 charger as an external charger. It does not include the SMB1360
chip, nor the VM-BMS, nor the linear charger.

Remove the extraneous drivers and enable QPNP_SMBCHARGER and
SMB135X_CHARGER.

Change-Id: I6db4f4c2aae2130b05806d7e0ee383565c734628
Signed-off-by: Xiaozhe Shi <xiaozhes@codeaurora.org>