kconfig: Let the application decide the name of the kernel bin

This introduces a new option

	CONFIG_KERNEL_BIN_NAME

that can be used in the kernel configuration (kconfig) to set
the final binary name, for example you can set:

CONFIG_KERNEL_BIN_NAME="test_app"

in the project.conf and this will result in

test_app.{elf,bin} in outdir.

The default is still using the type of the kernel being used, i.e.

microkernel.elf or nanokernel.elf

Change-Id: Id6c437af2ce4c02cb52d4e1e41b29e64d83f9aab
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
2 files changed