ARM: debug: Enable DEBUG_BCM_5301X for Northstar Plus SoCs

Northstar Plus SoCs (ARCH_BCM_NSP) have the exact same UART location and
properties like the register shift of 0, so make it usable.
Acked-by: Jon Mason <jon.mason@broadcom.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

arch/arm/Kconfig.debug

@@ -138,8 +138,8 @@ choice
 		select DEBUG_UART_PL01X
 
 	config DEBUG_BCM_5301X
-		bool "Kernel low-level debugging on BCM5301X UART1"
-		depends on ARCH_BCM_5301X
+		bool "Kernel low-level debugging on BCM5301X/NSP UART1"
+		depends on ARCH_BCM_5301X || ARCH_BCM_NSP
 		select DEBUG_UART_8250
 
 	config DEBUG_BCM_KONA_UART