Convert CONFIG_SYS_FLASH_QUIET_TEST to Kconfig

This converts the following to Kconfig:
   CONFIG_SYS_FLASH_QUIET_TEST

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/P1020RDB-PC_defconfig b/configs/P1020RDB-PC_defconfig
index 57d5958..c5988e7 100644
--- a/configs/P1020RDB-PC_defconfig
+++ b/configs/P1020RDB-PC_defconfig
@@ -78,6 +78,7 @@
 CONFIG_SYS_FLASH_USE_BUFFER_WRITE=y
 CONFIG_SYS_FLASH_EMPTY_INFO=y
 CONFIG_SYS_FLASH_CFI=y
+CONFIG_SYS_FLASH_QUIET_TEST=y
 CONFIG_SYS_MAX_FLASH_SECT=128
 CONFIG_DM_SPI_FLASH=y
 CONFIG_SF_DEFAULT_SPEED=10000000