all branches newer than jellyfish (koi, master, next) should start to use agl-demo-platform-crosssdk instead of agl-image-ivi-crosssdk . Likewise if no -crosssdk .

Preparations in releng-scripts and ci-management are required.

Details on h3ulcb-nogfx changes:

• needed for >= koi (aka koi, master, next) . not for old branches like 'halibut, jellyfish' . (can special-case for halibut&jellyfish only)
• See https://git.automotivelinux.org/ci-management/tree/jjb/common/include-agl-header.sh#n140 
• can check for 'if test x"halibut" = x"${TARGETBRANCH}" -o x"jellyfish" 0 x"${TARGETBRANCH}"
• but need to move 'agl-refhw-h3' addition out of that case (agl-refhw-h3 is true for koi/master/next)
• flip https://git.automotivelinux.org/ci-management/tree/jjb/common/include-agl-header.sh#n168   so raspberrypi4-64 is default and only reset for halibut
  also stage changes to releng-scripts agl-image-ivi-crosssdk -> agl-demo-platform-crosssdk (or similar) for jellyfish, koi, master there