doc: remove references to Automotive SDC scenario

[dbkinder]

We still have mention of the Software Defined Cockpit (SDC) scenario in our documentation that should probably be removed now.

We do still have some SDC scenarios defined for specific boards, but none in the generic templates:

./config_tools/data/qemu/sdc.xml
./config_tools/data/whl-ipc-i5/sdc_launch_1uos_zephyr.xml
./config_tools/data/whl-ipc-i5/sdc_launch_1uos_laag.xml
./config_tools/data/whl-ipc-i5/sdc.xml

Here's a grep through the .rst documentation:

developer-guides/hld/hld-overview.rst:Software-defined Cockpit (SDC), or the In-vehicle Experience (IVE) for
developer-guides/hld/hld-overview.rst:The SDC system consists of multiple systems: the instrument cluster (IC)
developer-guides/hld/hld-overview.rst:ACRN 1.0 is designed mainly for auto use cases such as SDC & IVI.
developer-guides/hld/hld-overview.rst:Cockpit (SDC) use case, and may require functional safety certification
developer-guides/hld/hld-security.rst:used to build a Software Defined Cockpit (SDC) or an In-Vehicle Experience
developer-guides/hld/hld-security.rst:   SDC and IVE system In-Vehicle
developer-guides/hld/hld-security.rst:In an SDC system, the Service VM also contains safety-critical IC (Instrument
tutorials/acrn_on_qemu.rst:      make BOARD=qemu SCENARIO=sdc
tutorials/acrn_on_qemu.rst:         echo 'Loading ACRN hypervisor with SDC scenario ...'
tutorials/run_kata_containers.rst:   the Industry or SDC scenarios.
tutorials/sgx_virtualization.rst:   Apply the patch to enable SGX support in User VM in the SDC scenario:
tutorials/using_zephyr_as_uos.rst:   This tutorial uses the (default) SDC scenario. If you use a different
tutorials/vuart_configuration.rst:| SDC             | Service VM            | Post-launched      | Post-launched  |                |
tutorials/vuart_configuration.rst:| SDC             | Service VM            | Post-launched      | Post-launched       |                |

[amyreye]

@dbkinder In hld-overview.rst and hld-security.rst, is the content generic enough that we can keep it?

[amyreye]

FYI: ./config_tools/data/qemu/sdc.xml was changed to ./config_tools/data/qemu/shared.xml in #6956.

[amyreye]

@dbkinder In hld-overview.rst and hld-security.rst, is the content generic enough that we can keep it?

Decision is to remove only mentions of Software Defined Cockpit (SDC) as a predefined scenario, and keep generic mentions.

[amyreye]

@dbkinder In hld-overview.rst and hld-security.rst, is the content generic enough that we can keep it?

@dbkinder Please confirm that we can keep hld-overview.rst and hld-security.rst as is, because references to SDC are generic enough.

[amyreye]

@dbkinder In hld-overview.rst and hld-security.rst, is the content generic enough that we can keep it?

@dbkinder Please confirm that we can keep hld-overview.rst and hld-security.rst as is, because references to SDC are generic enough.

Plan is to keep hld-security.rst as is. In the hld-overview.rst, change the section title from "ACRN Supported Use Cases" to just "ACRN Use Cases" (drop the supported).