ARM: CSR: PM: use outer_resume to resume L2 cache

now we move l2x0 resume to Linux from bootloader since l2x0 already has
resume support in core.

Signed-off-by: Barry Song <Baohua.Song@csr.com>
diff --git a/arch/arm/mach-prima2/pm.c b/arch/arm/mach-prima2/pm.c
index 0ba39f3..cb53160 100644
--- a/arch/arm/mach-prima2/pm.c
+++ b/arch/arm/mach-prima2/pm.c
@@ -71,6 +71,7 @@
 		outer_disable();
 		/* go zzz */
 		cpu_suspend(0, sirfsoc_finish_suspend);
+		outer_resume();
 		break;
 	default:
 		return -EINVAL;