arm64/kexec: Enable kexec in the arm64 defconfig

Signed-off-by: Geoff Levand <geoff@infradead.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

Conflicts:
	arch/arm64/configs/defconfig
due to missing commit 531d3067314f ("arm64: defconfig: updates for 4.5")

Author: glevand

arch/arm64/configs/defconfig

@@ -58,6 +58,7 @@ CONFIG_PREEMPT=y
 CONFIG_KSM=y
 CONFIG_TRANSPARENT_HUGEPAGE=y
 CONFIG_CMA=y
+CONFIG_KEXEC=y
 CONFIG_CMDLINE="console=ttyAMA0"
 # CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS is not set
 CONFIG_COMPAT=y