Convert CONFIG_SYS_CONSOLE_INFO_QUIET to Kconfig

This converts the following to Kconfig:
   CONFIG_SYS_CONSOLE_INFO_QUIET

Signed-off-by: Simon Glass <sjg@chromium.org>
[trini: Make this default n, re-run the migration]
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/am335x_sl50_defconfig b/configs/am335x_sl50_defconfig
index 89c45da..f49407e 100644
--- a/configs/am335x_sl50_defconfig
+++ b/configs/am335x_sl50_defconfig
@@ -17,6 +17,7 @@
 CONFIG_SPL_YMODEM_SUPPORT=y
 CONFIG_FIT=y
 CONFIG_SYS_EXTRA_OPTIONS="EMMC_BOOT"
+CONFIG_SYS_CONSOLE_INFO_QUIET=y
 CONFIG_VERSION_VARIABLE=y
 CONFIG_SPL=y
 CONFIG_SPL_STACK_R=y