MX53: Remove CONFIG_SYS_BOOTMAPSZ from mx53 config files.
commit ed59e58 (Remove device tree booting dependency on CONFIG_SYS_BOOTMAPSZ) made the
definition of CONFIG_SYS_BOOTMAPSZ unnecessary.
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Acked-by: Jason Liu <jason.hui@linaro.org>