um: x86_64: Remove the FRAME_WARN config option

Compilation for x86_64_defconfig gives the following warning:

net/core/rtnetlink.c:3099:1: warning: the frame size of 1280 bytes is
larger than 1024 bytes [-Wframe-larger-than=].
It is introduced by the commit:
rtnetlink: Remove VLA usage (ccf8dbcd).
As suggested by this email thread:
https://www.mail-archive.com/netdev@vger.kernel.org/msg239148.html



arch/um/configs/x86_64_defconfig:CONFIG_FRAME_WARN=1024
lib/Kconfig.debug:
config FRAME_WARN
        int "Warn for stack frames larger than (needs gcc 4.4)"
        range 0 8192
        default 3072 if KASAN_EXTRA
        default 2048 if GCC_PLUGIN_LATENT_ENTROPY
        default 1280 if (!64BIT && PARISC)
        default 1024 if (!64BIT && !PARISC)
        default 2048 if 64BIT

Just dropping the defconfig there should fix it.

Change-Id: Ie5374721152dd888d6ea18bfc05538d454efe249
Signed-off-by: Rishabh Bhatnagar <rishabhb@codeaurora.org>