common/Kconfig: Add DISPLAY_CPUINFO

Create a Kconfig entry for DISPLAY_CPUINFO and make it be the default
in certain architectures.  Migrate all config files.

Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/stm32f746-disco_defconfig b/configs/stm32f746-disco_defconfig
index e3e6333..e26cf96 100644
--- a/configs/stm32f746-disco_defconfig
+++ b/configs/stm32f746-disco_defconfig
@@ -3,6 +3,7 @@
 CONFIG_STM32F7=y
 CONFIG_TARGET_STM32F746_DISCO=y
 CONFIG_BOOTDELAY=3
+# CONFIG_DISPLAY_CPUINFO is not set
 CONFIG_HUSH_PARSER=y
 CONFIG_SYS_PROMPT="U-Boot > "
 CONFIG_AUTOBOOT_KEYED=y