global: Move remaining CONFIG_SYS_* to CFG_SYS_*

The rest of the unmigrated CONFIG symbols in the CONFIG_SYS namespace do
not easily transition to Kconfig. In many cases they likely should come
from the device tree instead. Move these out of CONFIG namespace and in
to CFG namespace.

Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/mach-at91/armv7/cpu.c b/arch/arm/mach-at91/armv7/cpu.c
index 9b37534..616621a 100644
--- a/arch/arm/mach-at91/armv7/cpu.c
+++ b/arch/arm/mach-at91/armv7/cpu.c
@@ -18,8 +18,8 @@
 #include <asm/arch/at91_gpbr.h>
 #include <asm/arch/clk.h>
 
-#ifndef CONFIG_SYS_AT91_MAIN_CLOCK
-#define CONFIG_SYS_AT91_MAIN_CLOCK 0
+#ifndef CFG_SYS_AT91_MAIN_CLOCK
+#define CFG_SYS_AT91_MAIN_CLOCK 0
 #endif
 
 int arch_cpu_init(void)
@@ -27,7 +27,7 @@
 #if defined(CONFIG_CLK_CCF)
 	return 0;
 #else
-	return at91_clock_init(CONFIG_SYS_AT91_MAIN_CLOCK);
+	return at91_clock_init(CFG_SYS_AT91_MAIN_CLOCK);
 #endif
 }