clk: mvebu: Add the xtal clock for Armada 3700 SoC

This clock is the parent of all the Armada 3700 clocks. It is a fixed
rate clock which depends on the gpio configuration read when resetting
the SoC.

Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
diff --git a/drivers/clk/mvebu/Kconfig b/drivers/clk/mvebu/Kconfig
index 3165da7..fddc8ac 100644
--- a/drivers/clk/mvebu/Kconfig
+++ b/drivers/clk/mvebu/Kconfig
@@ -24,6 +24,9 @@
 	bool
 	select MVEBU_CLK_COMMON
 
+config ARMADA_37XX_CLK
+       bool
+
 config ARMADA_XP_CLK
 	bool
 	select MVEBU_CLK_COMMON