Convert CONFIG_SYS_TIMER_COUNTS_DOWN to Kconfig

This converts the following to Kconfig:
   CONFIG_SYS_TIMER_COUNTS_DOWN

Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/configs/socfpga_de1_soc_defconfig b/configs/socfpga_de1_soc_defconfig
index 68a3689..613bf44 100644
--- a/configs/socfpga_de1_soc_defconfig
+++ b/configs/socfpga_de1_soc_defconfig
@@ -60,4 +60,5 @@
 CONFIG_USB=y
 CONFIG_USB_DWC2=y
 # CONFIG_SPL_WDT is not set
+CONFIG_SYS_TIMER_COUNTS_DOWN=y
 # CONFIG_EFI_LOADER is not set