[VP] [PDVT-SH] Refactor VEBOX capture pipe and tiling convert logic

Extracted common VEBOX capture pipe state setup (black level correction and white balance parameters) and tiling convert command logic into shared helper functions in mhw_vebox_common_impl.h. Replaced duplicated code across 6 platform-specific implementations with calls to SetVeboxCapPipeStateCommon and SetupVeboxTilingConvertCommon. Reduces code duplication by ~690 lines while preserving platform-specific handling for compression and MOCS usage. No functional change to existing behavior.