mx6: Fix reset cause for Power On Reset case

After booting mx6qsabrelite from POR the following is reported:

CPU:   Freescale i.MX61 family rev1.0 at 792 MHz
Reset cause: unknown reset

This is because both the POR and WDOG bits are set after reset.

Fix this by also checking both bits in the POR case.
Signed-off-by: NFabio Estevam <fabio.estevam@freescale.com>

arch/arm/cpu/armv7/imx-common/cpu.c

@@ -44,6 +44,7 @@ static char *get_reset_cause(void)
 
 	switch (cause) {
 	case 0x00001:
+	case 0x00011:
 		return "POR";
 	case 0x00004:
 		return "CSU";