arm: mvebu: move SYS_MVEBU_PLL_CLOCK to Kconfig

The main PLL frequency is 2GHz for Armada-XP and 1GHZ for Armada 375,
38x and 39x.

[ Linux commit ae142bd9976532aa5232ab0b00e621690d8bfe6a ]

Signed-off-by: Chris Packham <judge.packham@gmail.com>
Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/arch/arm/mach-mvebu/Kconfig b/arch/arm/mach-mvebu/Kconfig
index 6e8026b..7733936 100644
--- a/arch/arm/mach-mvebu/Kconfig
+++ b/arch/arm/mach-mvebu/Kconfig
@@ -36,6 +36,12 @@
 	bool
 	select ARM64
 
+# Armada PLL frequency (used for NAND clock generation)
+config SYS_MVEBU_PLL_CLOCK
+	int
+	default "2000000000" if ARMADA_XP || ARMADA_3700 || ARMADA_8K
+	default "1000000000" if ARMADA_38X || ARMADA_375
+
 # Armada XP/38x SoC types...
 config MV78230
 	bool