roh: Fix ROH multi-BD cmdq issue

driver inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I77OGM



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When the ROH CMDQ processes multiple BDs, the operations are inconsistent
with those in the UM manual. As a result, the CMDQ parses unexpected return
values, interrupts the CMDQ processing process, and the ROH MIB statistics
query may fail.

This patch fix the process method of roh cmdq multiple BDs.

Signed-off-by: Ke Chen <chenke54@huawei.com>
Reviewed-by: Gang Zhang <gang.zhang@huawei.com>