[MIPS] Fix resume for 64K page size on R4000 class processors.

Problem reported by Peter Watkins <pwatkins@sicortex.com> but this is
a different fix.
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

arch/mips/kernel/r4k_switch.S

@@ -85,12 +85,7 @@
 	move	$28, a2
 	cpu_restore_nonscratch a1
 
-#if (_THREAD_SIZE - 32) < 0x10000
-	PTR_ADDIU	t0, $28, _THREAD_SIZE - 32
-#else
-	PTR_LI		t0, _THREAD_SIZE - 32
-	PTR_ADDU	t0, $28
-#endif
+	PTR_ADDU	t0, $28, _THREAD_SIZE - 32
 	set_saved_sp	t0, t1, t2
 #ifdef CONFIG_MIPS_MT_SMTC
 	/* Read-modify-writes of Status must be atomic on a VPE */