a8k: pm: extend MSS_TRIGGER_TIMEOUT

Very rarely, during cpuidle operations the following error
is seen: "PM MSG Trigger Timeout".
This is caused by slow handling of message interrutps
in the PM FW running on CM3 (under heavy PM operation load).

This is not a real issue, so we extend the timeout to
avoid the error prints.

Change-Id: I92fd6f2ff1ddf208b216c123880ded28a00b6e0e
Signed-off-by: Igal Liberman <igall@marvell.com>
Reviewed-on: http://vgitil04.il.marvell.com:8080/59670

Reviewed-by: Kostya Porotchkin <kostap@marvell.com>
Tested-by: iSoC Platform CI <ykjenk@marvell.com>

plat/marvell/a8k/common/mss/mss_pm_ipc.c

@@ -26,7 +26,7 @@
 
 #define MSS_MSG_INT_MASK	(0x80000000)
 #define MSS_TIMER_BASE		(MVEBU_REGS_BASE_MASK + 0x580110)
-#define MSS_TRIGGER_TIMEOUT	(1000)
+#define MSS_TRIGGER_TIMEOUT	(2000)
 
 /*****************************************************************************
  * mss_pm_ipc_msg_send