aspeed/smc: Fix number of dummy cycles for FAST_READ_4 command

aspeed/smc: Fix number of dummy cycles for FAST_READ_4 command

The Linux kernel recently started using FAST_READ_4 commands.
This results in flash read failures. At the same time, the m25p80
emulation is seen to read 8 more bytes than expected. Adjusting the
expected number of dummy cycles to match FAST_READ fixes the problem.

Fixes: f95c4bffdc4c ("aspeed/smc: snoop SPI transfers to fake dummy cycles")
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>