ARM: mvebu: make CPU_PJ4B selection a per-SoC choice

Until now, the CPU_PJ4B Kconfig option was selected by
MACH_ARMADA_MVEBU, i.e for all Armada MVEBU SOCs. In preparation to
the introduction of Cortex-A9 based Armada MVEBU SOCs, this selection
is moved down to the Armada 370 and Armada XP specific options.
Signed-off-by: NThomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: NJason Cooper <jason@lakedaemon.net>

arch/arm/mach-mvebu/Kconfig

@@ -26,11 +26,11 @@ config MACH_MVEBU_V7
 	select ARMADA_370_XP_TIMER
 	select HAVE_SMP
 	select CACHE_L2X0
-	select CPU_PJ4B
 
 config MACH_ARMADA_370
 	bool "Marvell Armada 370 boards"
 	select ARMADA_370_CLK
+	select CPU_PJ4B
 	select MACH_MVEBU_V7
 	select PINCTRL_ARMADA_370
 	help
@@ -40,6 +40,7 @@ config MACH_ARMADA_370
 config MACH_ARMADA_XP
 	bool "Marvell Armada XP boards"
 	select ARMADA_XP_CLK
+	select CPU_PJ4B
 	select MACH_MVEBU_V7
 	select PINCTRL_ARMADA_XP
 	help