ARM: imx_v6_v7_defconfig: Remove CONFIG_DEFAULT_MMAP_MIN_ADDR

By default CONFIG_DEFAULT_MMAP_MIN_ADDR is 4096 and can also be changed via
/proc/sys/vm/mmap_min_addr if needed.

Quoting Russell King (http://marc.info/?l=linux-arm-kernel&m=134401593807820&w=2):

"4096 is also fine for ARM too.  There's not much point in having
defconfigs change it - that would just be pure noise in the config
files."

,so remove CONFIG_DEFAULT_MMAP_MIN_ADDR from the defconfig file.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

arch/arm/configs/imx_v6_v7_defconfig

@@ -42,7 +42,6 @@ CONFIG_VMSPLIT_2G=y
 CONFIG_PREEMPT_VOLUNTARY=y
 CONFIG_AEABI=y
 # CONFIG_OABI_COMPAT is not set
-CONFIG_DEFAULT_MMAP_MIN_ADDR=32768
 CONFIG_CMDLINE="noinitrd console=ttymxc0,115200"
 CONFIG_VFP=y
 CONFIG_NEON=y