ARM: rockchip_defconfig: Enable CONFIG_COREDUMP

vts-testcase/kernel/api/proc/KernelProcFileApiTest
had added tests for the core_pattern.

https://android.googlesource.com/kernel/configs
5ed73dc4d482 ("add missing configs")

CONFIG_COREDUMP and CONFIG_ELF_CORE are recommended for diagnostic
purposes.

# CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS is not set
came from android-recommended.config

Change-Id: Ib16fcc6c126e8415976fea2d7e193565866bcf2d
Signed-off-by: Zhangbin Tong <zebulun.tong@rock-chips.com>
Signed-off-by: Tao Huang <huangtao@rock-chips.com>

Author: Zhangbin Tong

arch/arm/configs/rockchip_defconfig

@@ -74,7 +74,7 @@ CONFIG_CPU_IDLE=y
 CONFIG_VFP=y
 CONFIG_NEON=y
 CONFIG_KERNEL_MODE_NEON=y
-# CONFIG_COREDUMP is not set
+# CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS is not set
 CONFIG_PM_AUTOSLEEP=y
 CONFIG_PM_WAKELOCKS=y
 CONFIG_PM_WAKELOCKS_LIMIT=0