marvell: uart: a3720: Update delay code to be compatible with 1200 MHz CPU
marvell: uart: a3720: Update delay code to be compatible with 1200 MHz CPU

Console initialization function needs to wait at least minimal specified
time. The fastest Armada 3720 CPU is 1200 MHz so increase loop delay to
wait at least for 100 us on 1200 MHz variant too. The slowest Armada 3720
CPU is 600 MHz and in this case delay loop would take just 2 times more,
which is not a problem.

Signed-off-by: Pali Rohár <84fc5b246d98b743737687ddff985e1cb7a72c1e@kernel.org>
Change-Id: I1f0b4aabd0e08b7696feec631419f7f7c7ec17d2

achingupta/arm-trusted-firmware,achingupta/arm-trusted-firmware