arm/dt: msm8974: Remove PM8841 S5-S8 qpnp-regulator device nodes

These regulators will operate in ganged mode and will be controlled
by the krait regulator driver.

Remove these definitions.

Change-Id: I4b1c407241e35c571f20b382ef1b004733336d90
Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>