kconfig: move CONFIG_USE_PRIVATE_LIBGCC to Kconfig

The private libgcc is supported only on ARM, MIPS, PowerPC, SH, x86.
Those architectures should "select" HAVE_PRIVATE_LIBGCC and
CONFIG_USE_PRIVATE_LIBGCC should depend on it.

Currently, this option is enabled on Tegra boards and x86 architecture.
Move the definition from header files to Kconfig.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Tested-by: Simon Glass <sjg@chromium.org>
Acked-by: Simon Glass <sjg@chromium.org>
Cc: Stephen Warren <swarren@nvidia.com>
Cc: Tom Warren <twarren@nvidia.com>
diff --git a/arch/Kconfig b/arch/Kconfig
index bf26764..f63cc5a 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -7,6 +7,7 @@
 
 config ARM
 	bool "ARM architecture"
+	select HAVE_PRIVATE_LIBGCC
 	select SUPPORT_OF_CONTROL
 
 config AVR32
@@ -24,6 +25,7 @@
 
 config MIPS
 	bool "MIPS architecture"
+	select HAVE_PRIVATE_LIBGCC
 
 config NDS32
 	bool "NDS32 architecture"
@@ -36,6 +38,7 @@
 
 config PPC
 	bool "PowerPC architecture"
+	select HAVE_PRIVATE_LIBGCC
 
 config SANDBOX
 	bool "Sandbox"
@@ -43,12 +46,14 @@
 
 config SH
 	bool "SuperH architecture"
+	select HAVE_PRIVATE_LIBGCC
 
 config SPARC
 	bool "SPARC architecture"
 
 config X86
 	bool "x86 architecture"
+	select HAVE_PRIVATE_LIBGCC
 	select SUPPORT_OF_CONTROL
 
 endchoice