nvme: Remove the redundant aqa value setting

AQA (Admin Queue Attributes) register is a dword size with
lower word of ASQS, and higher word of ACQS.

The code set the variable aqa twice, but it is redundant.

Signed-off-by: Wesley Sheng <wesleyshenggit@sina.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/drivers/nvme/nvme.c b/drivers/nvme/nvme.c
index dc6c39b..424fe6d 100644
--- a/drivers/nvme/nvme.c
+++ b/drivers/nvme/nvme.c
@@ -387,7 +387,6 @@
 
 	aqa = nvmeq->q_depth - 1;
 	aqa |= aqa << 16;
-	aqa |= aqa << 16;
 
 	dev->page_size = 1 << page_shift;