Kconfig: Use spaces not tabs in Kconfig entires

While the Kconfig language seems to accept either form of whitespace, we
use a space throughout the project, except in these spots.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/arm/mach-exynos/Kconfig b/arch/arm/mach-exynos/Kconfig
index 0b4276c..7df0e17 100644
--- a/arch/arm/mach-exynos/Kconfig
+++ b/arch/arm/mach-exynos/Kconfig
@@ -141,7 +141,7 @@
 choice
 	prompt "EXYNOS7 board select"
 
-config  TARGET_ESPRESSO7420
+config TARGET_ESPRESSO7420
 	bool "ESPRESSO7420 board"
 	select ARM64
 	select ARMV8_MULTIENTRY