rtlwifi: rtl8821ae: Fix connection lost problem

rtlwifi: rtl8821ae: Fix connection lost problem

In commit 40b368af4b75 ("rtlwifi: Fix alignment issues"), the read
of REG_DBI_READ was changed from 16 to 8 bits. For unknown reasonsi
this change results in reduced stability for the wireless connection.
This regression was located using bisection.

Fixes: 40b368af4b75 ("rtlwifi: Fix alignment issues")
Reported-and-tested-by: James Cameron <[email protected]>
Signed-off-by: Larry Finger <[email protected]>
Cc: Stable <[email protected]> # 4.11+
Cc: Ping-Ke Shih <[email protected]>
Signed-off-by: Kalle Valo <[email protected]>