Some Freescale boards used an extra version of the constant to hold the
Generic Timer frequency. This can easily be covered by the now unified
COUNTER_FREQUENCY constant, so remove this extra variable from those
boards.
Signed-off-by: NAndre Przywara <andre.przywara@arm.com>
Reviewed-by: NYork Sun <york.sun@nxp.com>
Reviewed-by: NJagan Teki <jagan@openedev.com>