spmi: Only use Hikey 970 SPMI controller driver when ARM64

spmi: Only use Hikey 970 SPMI controller driver when ARM64

SPMI_HISI3670, the Hikey 970 SPMI controller driver, is only
required to use the Kirin 970 SPMI bus.

And the Kirin 970 is an ARM64-based SoC, it cannot be used on
platforms of other architectures.

Link: https://lore.kernel.org/all/b4810f476e41e7de4efdf28b42472ae4ffe7defe.1597647359.git.mchehab+huawei@kernel.org/
Reported-by: Wentao Guan <guanwentao@uniontech.com>
Closes: https://github.com/deepin-community/kernel/pull/604
Signed-off-by: WangYuli <wangyuli@uniontech.com>
Link: https://lore.kernel.org/r/23BAA675A75EF4F5+20250218050552.57711-1-wangyuli@uniontech.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Link: https://lore.kernel.org/r/20250518032330.2959766-2-sboyd@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>