arm64: kdump: enable kdump in defconfig

Kdump is enabled by default as kexec is.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
index 7c48028..927ee18 100644
--- a/arch/arm64/configs/defconfig
+++ b/arch/arm64/configs/defconfig
@@ -82,6 +82,7 @@
 CONFIG_SECCOMP=y
 CONFIG_XEN=y
 CONFIG_KEXEC=y
+CONFIG_CRASH_DUMP=y
 # CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS is not set
 CONFIG_COMPAT=y
 CONFIG_CPU_IDLE=y