Add custom default base address option to crossgen (dotnet/coreclr#25227)

Add custom default base address option to crossgen (dotnet/coreclr#25227)

* Add crossgen option to setup default base address for native image

This is enabled only with -DFEATURE_ENABLE_NO_ADDRESS_SPACE_RANDOMIZATION.

* Mmap native images at default base address if env variable COMPlus_UseDefaultBaseAddr=0x1 is setup.

This is enabled only with -DFEATURE_ENABLE_NO_ADDRESS_SPACE_RANDOMIZATION.

Commit migrated from https://github.com/dotnet/coreclr/commit/86e600cef40a650a8ffb294dd195186b1679609b