Initial sagit (Xiaomi Mi 6) support

Platform/Oneplus/msm8998/sagit.dsc

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+[Defines]
+  PLATFORM_NAME                  = sagit
+  PLATFORM_GUID                  = 28f1a3bf-193a-47e3-a7b9-5a435eaab2ee
+  PLATFORM_VERSION               = 0.1
+  DSC_SPECIFICATION              = 0x00010019
+  OUTPUT_DIRECTORY               = Build/$(PLATFORM_NAME)
+  SUPPORTED_ARCHITECTURES        = AARCH64
+  BUILD_TARGETS                  = DEBUG|RELEASE
+  SKUID_IDENTIFIER               = DEFAULT
+  FLASH_DEFINITION               = Platform/Qualcomm/msm8998/msm8998.fdf
+  DEVICE_DXE_FV_COMPONENTS       = Platform/Oneplus/msm8998/sagit.fdf.inc
+
+!include Platform/Qualcomm/msm8998/msm8998.dsc
+
+[BuildOptions.common]
+  GCC:*_*_AARCH64_CC_FLAGS = -DENABLE_SIMPLE_INIT -DENABLE_LINUX_SIMPLE_MASS_STORAGE
+
+[PcdsFixedAtBuild.common]
+  gQcomTokenSpaceGuid.PcdMipiFrameBufferWidth|1080
+  gQcomTokenSpaceGuid.PcdMipiFrameBufferHeight|1920
+
+  # Simple Init
+  gSimpleInitTokenSpaceGuid.PcdGuiDefaultDPI|300
+
+  gRenegadePkgTokenSpaceGuid.PcdDeviceVendor|"Xiaomi"
+  gRenegadePkgTokenSpaceGuid.PcdDeviceProduct|"Mi 6"
+  gRenegadePkgTokenSpaceGuid.PcdDeviceCodeName|"sagit"

Platform/Oneplus/msm8998/sagit.fdf.inc

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+// per-device BSP DXEs
+# FILE DRIVER = 5bd181db-0487-4f1a-ae73-820e165611b3 {
+#   SECTION DXE_DEPEX = Platform/EFI_Binaries/sagit/ButtonsDxe/ButtonsDxe.depex
+#   SECTION PE32 = Platform/EFI_Binaries/sagit/ButtonsDxe/ButtonsDxe.efi
+#   SECTION UI = "ButtonsDxe"
+# }
+
+// ACPI Tables
+# FILE FREEFORM = 7E374E25-8E01-4FEE-87F2-390C23C606CD {   
+#   SECTION RAW = Silicon/Qualcomm/sdm845/AcpiTables/DBG2.aml
+#   SECTION RAW = Platform/Xiaomi/sdm845/AcpiTables/polaris/DSDT.AML
+#   SECTION RAW = Silicon/Qualcomm/sdm845/AcpiTables/MADT.aml
+#   SECTION RAW = Silicon/Qualcomm/sdm845/AcpiTables/FADT.aml
+#   SECTION RAW = Silicon/Qualcomm/sdm845/AcpiTables/GTDT.aml
+#   SECTION RAW = Silicon/Qualcomm/sdm845/AcpiTables/IORT.aml
+#   SECTION RAW = Silicon/Qualcomm/sdm845/AcpiTables/PPTT.aml
+#   SECTION UI = "AcpiTables"
+# }
+
+// Mainline device tree blob
+#FILE FREEFORM = 25462CDA-221F-47DF-AC1D-259CFAA4E326 {
+#  SECTION RAW = Platform/Oneplus/msm8998/FdtBlob/msm8998-xiaomi-sagit.dtb
+#}
+

configs/sagit.conf

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+DSC_FILE="Platform/Oneplus/msm8998/sagit.dsc"
+DTB_FILE="Platform/Oneplus/msm8998/FdtBlob_compat/sagit.dtb"
+SOC_PLATFORM="MSM8998"
+
+# mkbootimg config
+BOOTIMG_OS_PATCH_LEVEL="2022-08"
+BOOTIMG_OS_VERSION=12.0.0
+# LineageOS 19 config