riscv: Add machine name to kernel boot log and stack dump output

[ Upstream commit 46ad48e8 ]

Add the machine name to kernel boot-up log, and install
the machine name to stack dump for DT boot mode.

Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
Stable-dep-of: 10f6913c ("riscv: always honor the CONFIG_CMDLINE_FORCE when parsing dtb")
Signed-off-by: Sasha Levin <sashal@kernel.org>