sunxi: use CONFIG_SYS_CLK_FREQ to set cpu clock

make the CPU clock selectable via Kconfig

this removes the sunxi specific CONFIG_CLK_FULL_SPEED defined in each
soc header and replaces it's use in board/sunxi/board.c with
CONFIG_SYS_CLK_FREQ from Kconfig which allows us to configure board
specific frequency on boot

Signed-off-by: Iain Paton <ipaton0@gmail.com>
[hdegoede@redhat.com s/CONFIG_SYS_CLK_FREQ/CONFIG_TIMER_CLK_FREQ/ for the
 arch-timer clk speed on sun7i to fix mis-compile on sun7i]
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

include/configs/sun4i.h

@@ -11,7 +11,6 @@
 /*
  * A10 specific configuration
  */
-#define CONFIG_CLK_FULL_SPEED		1008000000
 
 #ifdef CONFIG_USB_EHCI
 #define CONFIG_USB_EHCI_SUNXI

include/configs/sun5i.h

@@ -11,7 +11,6 @@
 /*
  * High Level Configuration Options
  */
-#define CONFIG_CLK_FULL_SPEED		1008000000
 
 #ifdef CONFIG_USB_EHCI
 #define CONFIG_USB_EHCI_SUNXI

include/configs/sun6i.h

@@ -14,7 +14,6 @@
 /*
  * A31 specific configuration
  */
-#define CONFIG_CLK_FULL_SPEED		1008000000
 
 #ifdef CONFIG_USB_EHCI
 #define CONFIG_USB_EHCI_SUNXI

include/configs/sun7i.h

@@ -12,7 +12,6 @@
 /*
  * A20 specific configuration
  */
-#define CONFIG_CLK_FULL_SPEED		912000000
 
 #ifdef CONFIG_USB_EHCI
 #define CONFIG_USB_EHCI_SUNXI
@@ -21,8 +20,7 @@
 
 #define CONFIG_ARMV7_PSCI		1
 #define CONFIG_ARMV7_SECURE_BASE	SUNXI_SRAM_B_BASE
-#define CONFIG_SYS_CLK_FREQ		24000000
-#define CONFIG_TIMER_CLK_FREQ		CONFIG_SYS_CLK_FREQ
+#define CONFIG_TIMER_CLK_FREQ		24000000
 
 /*
  * Include common sunxi configuration where most the settings are

include/configs/sun8i.h

@@ -12,7 +12,6 @@
 /*
  * A23 specific configuration
  */
-#define CONFIG_CLK_FULL_SPEED	1008000000
 
 #ifdef CONFIG_USB_EHCI
 #define CONFIG_USB_EHCI_SUNXI