BoardConfig: Set userdataimage part. size to unknown

Change-Id: Ib4bd3d9ee9526df2381b3162694d6668df05128d
Build ext4 partitions
Thx Kirmaniarslan: https://github.com/Kirmaniarslan/android_device_htc_pico/commit/67bc09d4270952d65712044c4dd193188292996b

Change-Id: Ic5627b3001731a245f59e174d400448b411fb9f8
Don't generate block mode update zips
Thx Kirmaniarslan: https://github.com/Kirmaniarslan/android_device_htc_pico/commit/8aaded12528b84c38e87409430c16276c6bbf2f0

Change-Id: I7dea880c90207a7d07f5f60aef118760bf5dd718
Enable SystemUI flags to optimize performance
Thx Kirmaniarslan: https://github.com/Kirmaniarslan/android_device_htc_pico/commit/2e1c6910cbd92584a335d6fb9a002aa3fcdc2a91

Change-Id: I8c429dfa6b5dd6255efcaec6dd6d3cd4bed2c3d9
Restore deleted parts in BOARD_KERNEL_CMDLINE
Was deleted in this commit: https://github.com/spezi77/android_device_htc_bravo/commit/1a98138ba55fec2b22aeaa2a70d9d3b91fe66cc7

Change-Id: I413c0d74647e87a0b73d9d5170de008ac97688f4