sunxi: Add missing CONFIG_ARMV7_PSCI_NR_CPUS for sun7i

sun7i has 2 CPUs.
Signed-off-by: NChen-Yu Tsai <wens@csie.org>
Signed-off-by: NHans de Goede <hdegoede@redhat.com>

include/configs/sun7i.h

@@ -21,6 +21,7 @@
 #define CONFIG_SUNXI_USB_PHYS	3
 
 #define CONFIG_ARMV7_PSCI		1
+#define CONFIG_ARMV7_PSCI_NR_CPUS	2
 #define CONFIG_ARMV7_SECURE_BASE	SUNXI_SRAM_B_BASE
 
 /*