arch: arc: remove unused codes

base.user_options is already set in k_thread_
user_mode_enter

Signed-off-by: Wayne Ren <wei.ren@synopsys.com>

arch/arc/Kconfig

diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
index 3e3b766..0ffff37 100644
--- a/arch/arc/Kconfig
+++ b/arch/arc/Kconfig
@@ -40,7 +40,7 @@
 
 config	CPU_ARCV2
 	bool
-	select		ARCH_HAS_STACK_PROTECTION
+	select ARCH_HAS_STACK_PROTECTION
 	select ARCH_HAS_USERSPACE if ARC_CORE_MPU
 	default y
 	help

arch/arc/core/thread.c

diff --git a/arch/arc/core/thread.c b/arch/arc/core/thread.c
index 9041181..59f2818 100644
--- a/arch/arc/core/thread.c
+++ b/arch/arc/core/thread.c
@@ -194,7 +194,6 @@
 FUNC_NORETURN void _arch_user_mode_enter(k_thread_entry_t user_entry,
 	void *p1, void *p2, void *p3)
 {
-	_current->base.user_options |= K_USER;
 
 	/*
 	 * adjust the thread stack layout