Revert "omap: pm: adapt powerdomain config for modem backport 3.4"

This reverts commit 5ec0116f39a7bfb267b5c7dfe0c6ad364be806c5.
Revert "Edison: Use 3.4 modem backport"

This reverts commit 93b454fea415f93005768ba16e7a89617f1f5692.
Revert "defconfig: add config option for 3.4 kernel modem backport"

This reverts commit 8103c75259f62d31d42f93cb1dd7e923d8d0261a.
Revert "Edison: modem: Rename config option to CONFIG_BACKPORT_MODEM"

This reverts commit 41375cbad2a46b5931c8be9cd41c5a60afff95fb.
Revert "Revert "Edison: modem: Rename config option to CONFIG_BACKPORT_MODEM""

This reverts commit ca1035374d453cf1bbe9ccbc36e6acd66bf99e74.
Modem: rename config option to CONFIG_308_MODEM

just want to avoid confusion :P