nios: remove nios-32 arch

The nios-32 arch is obsolete and broken. So it is removed.

Signed-off-by: Thomas Chou <thomas@wytron.com.tw>

examples/standalone/stubs.c

@@ -65,23 +65,6 @@ gd_t *global_data;
 "	lw	$25, %1($25)\n"		\
 "	jr	$25\n"			\
 	: : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "t9");
-#elif defined(CONFIG_NIOS)
-/*
- * %g7 holds the pointer to the global_data. %g0 is call clobbered.
- */
-#define EXPORT_FUNC(x) \
-	asm volatile (			\
-"	.globl " #x "\n"		\
-#x ":\n"				\
-"	pfx	%%hi(%0)\n"		\
-"	movi	%%g0, %%lo(%0)\n"	\
-"	add	%%g0, %%g7\n"		\
-"	ld	%%g0, [%%g0]\n"		\
-"	pfx	%1\n"			\
-"	ld	%%g0, [%%g0]\n"		\
-"	jmp	%%g0\n"			\
-"	nop	\n"			\
-	: : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x) : "r0");
 #elif defined(CONFIG_NIOS2)
 /*
  * gp holds the pointer to the global_data, r8 is call-clobbered