x86/unwinder: Make CONFIG_UNWINDER_ORC=y the default in the 64-bit defconfig

x86/unwinder: Make CONFIG_UNWINDER_ORC=y the default in the 64-bit defconfig

commit 1e4078f0bba46ad61b69548abe6a6faf63b89380 upstream.

Increase testing coverage by turning on the primary x86 unwinder for
the 64-bit defconfig.

Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>