platform: msm_shared: add support for dual_pipe standalone panel mode
platform: msm_shared: add support for dual_pipe standalone panel mode

Current implementation assumes that whenever dual pipe panel mode
is selected split_display is assumed. But this is not true when single
interface display is used with dual_pipe configuration. i.e. 1080p
panel with 540x1920 on each layer mixer. In this new configuration,
pipe staging is different where LM0 and LM1 of same CTL path is used.
Update implementation to accommodate this new requirement.

Change-Id: Ib67593891013d82bc641fdf2320ae8e5a363c95e

Foxda-Tech/polaris-bootable-bootloader-lk,Foxda-Tech/polaris-bootable-bootloader-lk,Foxda-Tech/polaris-bootable-bootloader-lk,efidroid/lk,CanarySolutions/little-kernel,Foxda-Tech/polaris-bootable-bootloader-lk,CanarySolutions/little-kernel,efidroid/lk,CanarySolutions/little-kernel,CanarySolutions/little-kernel,Foxda-Tech/polaris-bootable-bootloader-lk,CanarySolutions/little-kernel,efidroid/lk,efidroid/lk,efidroid/lk