[LOCAL] arm64: renesas: defconfig: Update renesas_defconfig

Update the defconfig for Renesas ARM64 systems:
  - Compile the kernel with warnings as errors,
  - Enable kexec file based system call (kexec is cool).

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
diff --git a/arch/arm64/configs/renesas_defconfig b/arch/arm64/configs/renesas_defconfig
index 81d063c..3af50a3 100644
--- a/arch/arm64/configs/renesas_defconfig
+++ b/arch/arm64/configs/renesas_defconfig
@@ -1,3 +1,4 @@
+CONFIG_WERROR=y
 CONFIG_LOCALVERSION="-arm64-renesas"
 CONFIG_SYSVIPC=y
 CONFIG_POSIX_MQUEUE=y
@@ -26,6 +27,7 @@
 CONFIG_BLK_DEV_INITRD=y
 CONFIG_PROFILING=y
 CONFIG_KEXEC=y
+CONFIG_KEXEC_FILE=y
 CONFIG_ARCH_RENESAS=y
 # CONFIG_AMPERE_ERRATUM_AC03_CPU_38 is not set
 # CONFIG_ARM64_ERRATUM_1508412 is not set