uboot-imx

config: remove platform CONFIG_SYS_HZ definition part 3

This commit removes platform CONFIG_SYS_HZ definition for the
remainders of part1 (commit cdb23792) and part2 (commit f232950f).

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Cc: Rob Herring <rob.herring@calxeda.com>