ARM: dts: aspeed: asrock: Correct firmware flash SPI clocks

commit 9dedb724 upstream.

While I'm not aware of any problems that have occurred running these
at 100 MHz, the official word from ASRock is that 50 MHz is the
correct speed to use, so let's be safe and use that instead.

Signed-off-by: Zev Weiss <zev@bewilderbeest.net>
Cc: stable@vger.kernel.org
Fixes: 2b81613c ("ARM: dts: aspeed: Add ASRock E3C246D4I BMC")
Fixes: a9a3d60b ("ARM: dts: aspeed: Add ASRock ROMED8HM3 BMC")
Link: https://lore.kernel.org/r/20230224000400.12226-4-zev@bewilderbeest.net


Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>