accel/amdxdna: Fix suspend failure after enabling turbo mode

Enabling turbo mode disables hardware clock gating. Suspend requires
hardware clock gating to be re-enabled, otherwise suspend will fail.
Fix this by calling aie2_runtime_cfg() from aie2_hw_stop() to
re-enable clock gating during suspend. Also ensure that firmware is
initialized in aie2_hw_start() before modifying clock-gating
settings during resume.

Fixes: f4d7b8a6bc8c ("accel/amdxdna: Enhance power management settings")
Reviewed-by: Mario Limonciello (AMD) <superm1@kernel.org>
Signed-off-by: Lizhi Hou <lizhi.hou@amd.com>
Link: https://patch.msgid.link/20260211204716.722788-1-lizhi.hou@amd.com

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