Add support for a section(s) ".noinit*" that will be allocated in ram,
but not cleared or initialized. This can be used for passing variables
between a bootloader and an app for instance, or even just between
restarts of your application.
Without any assigned usages of the section, there is zero change in ram
usage. The align does nothing when the prior section was already
aligned.
Instead of every "simple" target having their own duplicate file with
all the section mappings, just provide a single, simple,
"cortex-m-generic.ld" that works with our startup code and any simple
rom/ram system. This also drops the pointless copying of files all over
the place. Using -L flags properly is sufficient, and the standard file
is now in the root of the library already.
