acpica: ACPI_MAX_SLEEP should be 2 sec, not 20

This limit is a workaround for AML that sleeps too long,
but the workaround didn't work b/c of a typo.

https://bugzilla.kernel.org/show_bug.cgi?id=13195

Signed-off-by: Len Brown <len.brown@intel.com>
cc: stable@kernel.org # 2.6.35..3.0

drivers/acpi/acpica/acconfig.h

@@ -121,7 +121,7 @@
 
 /* Maximum sleep allowed via Sleep() operator */
 
-#define ACPI_MAX_SLEEP                  20000	/* Two seconds */
+#define ACPI_MAX_SLEEP                  2000	/* Two seconds */
 
 /******************************************************************************
  *