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/pxm2_defconfig b/configs/pxm2_defconfig
index 8b9a890..6f5f790 100644
--- a/configs/pxm2_defconfig
+++ b/configs/pxm2_defconfig
@@ -17,6 +17,7 @@
 CONFIG_DEFAULT_DEVICE_TREE="am335x-pxm50"
 CONFIG_FIT=y
 CONFIG_BOOTDELAY=3
+# CONFIG_DISPLAY_CPUINFO is not set
 CONFIG_SPL=y
 CONFIG_HUSH_PARSER=y
 CONFIG_SYS_PROMPT="U-Boot# "