watchdog: sbsa: only use 32-bit accessors

watchdog: sbsa: only use 32-bit accessors

SBSA says of the generic watchdog:

  All registers are 32 bits in size and should be accessed using 32-bit
  reads and writes. If an access size other than 32 bits is used then
  the results are IMPLEMENTATION DEFINED.

and for qemu, the implementation will only allow 32-bit accesses
resulting in a synchronous external abort when configuring the watchdog.
Use lo_hi_* accessors rather than a readq/writeq.

Fixes: abd3ac7902fb ("watchdog: sbsa: Support architecture version 1")
Signed-off-by: Jamie Iles <quic_jiles@quicinc.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Shaokun Zhang <zhangshaokun@hisilicon.com>
Link: https://lore.kernel.org/r/20210903112101.493552-1-quic_jiles@quicinc.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>