With the exception of hw/core/, the hw/ directory only contains
device models used in system emulation. Semihosting is also used
by user emulation. As a generic feature, move it out of hw/ directory.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20210226131356.3964782-3-f4bug@amsat.org>
Message-Id: <20210305135451.15427-3-alex.bennee@linaro.org>

There is no reason to write MINIKCONF_DEPS manually, since minikconf.py
emits a dependency file, and also no reason to list multiple Kconfig
files on the command line since they can be included from a master file
in the top-level source directory.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>