ARM: imx_v6_v7_defconfig: Select CONFIG_KPROBES

Building lttng-modules without CONFIG_KPROBES selected gives a build
error.

Select CONFIG_KPROBES by default.
Signed-off-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/configs/imx_v6_v7_defconfig

@@ -53,6 +53,7 @@ CONFIG_VFP=y
 CONFIG_NEON=y
 CONFIG_PM_DEBUG=y
 CONFIG_PM_TEST_SUSPEND=y
+CONFIG_KPROBES=y
 CONFIG_MODULES=y
 CONFIG_MODULE_UNLOAD=y
 CONFIG_MODVERSIONS=y