MIPS: Add support for full dynticks CPU time accounting

With the correct cmpxchg64 on 32-bit platforms, we can now add the config
HAVE_VIRT_CPU_ACCOUNTING_GEN into arch/mips/Kconfig.

Signed-off-by: Deng-Cheng Zhu <dengcheng.zhu@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: macro@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9475/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 859fe30..17983ac 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -55,6 +55,7 @@
 	select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
 	select ARCH_BINFMT_ELF_STATE
 	select SYSCTL_EXCEPTION_TRACE
+	select HAVE_VIRT_CPU_ACCOUNTING_GEN
 
 menu "Machine selection"