If multiple control fields in GCMD_REG register need to be modified, software
must serialize the modifications through multiple writes to this register.
So one-shot bits (bits 30-29, 27 and 24) in gcmd should not been set.
Otherwise, other control field may be written to GCMD_REG at the same time
with one-shot bit (Clearing one-shot bit has no effect, software sets this field
would set/update this control field used by hardware).
Tracked-On: #7381
Signed-off-by: Fei Li <fei1.li@intel.com>
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