arm: mach-k3: Detect and print reset reason

Call get_reset_reason() during CPU info output and display the result
if the SoC provides the implementation. This helps in debugging by
providing context on the last system reset reason.

Signed-off-by: Wadim Egorov <w.egorov@phytec.de>

arch/arm/mach-k3/common.c

@@ -175,11 +175,17 @@ static const char *get_device_type_name(void)
 	}
 }
 
+__weak const char *get_reset_reason(void)
+{
+	return NULL;
+}
+
 int print_cpuinfo(void)
 {
 	struct udevice *soc;
 	char name[64];
 	int ret;
+	const char *reset_reason;
 
 	printf("SoC:   ");
 
@@ -201,6 +207,10 @@ int print_cpuinfo(void)
 
 	printf("%s\n", get_device_type_name());
 
+	reset_reason = get_reset_reason();
+	if (reset_reason)
+		printf("Reset reason: %s\n", reset_reason);
+
 	return 0;
 }
 #endif

arch/arm/mach-k3/include/mach/hardware.h

@@ -125,4 +125,5 @@ struct rom_extended_boot_data {
 };
 
 u32 get_boot_device(void);
+const char *get_reset_reason(void);
 #endif /* _ASM_ARCH_HARDWARE_H_ */