samsung-gprime: Split into fortuna{3g,ltezt} and gprimelte{can,xx}

Closes !2894 (closed) and !2962

Device changes

• samsung-gprimeltecan: (contributed by @SiddharthManthan, @buddyjojo and @wonderfulShrineMaidenOfParadise)
  • Renamed from samsung-gprime
  • Replace deviceinfo_dtb_mainline with deviceinfo_dtb in deviceinfo
  • Define deviceinfo_modules_initfs="panel-samsung-s6d78a0-gh9607501a msm zinitix" in deviceinfo
  • Define deviceinfo_gpu_accelerated="true" in deviceinfo

New devices

• samsung-fortuna3g: new device variant of samsung-gprime (contributed by @SiddharthManthan)
• samsung-fortunaltezt: new device variant of samsung-gprime (contributed by @wonderfulShrineMaidenOfParadise)
• samsung-gprimeltexx: new device variant of samsung-gprime (contributed by @haroldsoixante)

Cc: @Minecrell @TravMurav @buddyjojo @SiddharthManthan @wonderfulShrineMaidenOfParadise @haroldsoixante