x86: Convert to use driver model timer

Convert all x86 boards to use driver model tsc timer.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/configs/galileo_defconfig b/configs/galileo_defconfig
index 3612350..0604aa7 100644
--- a/configs/galileo_defconfig
+++ b/configs/galileo_defconfig
@@ -24,6 +24,7 @@
 CONFIG_DM_RTC=y
 CONFIG_SYS_NS16550=y
 CONFIG_ICH_SPI=y
+CONFIG_TIMER=y
 CONFIG_USB=y
 CONFIG_DM_USB=y
 CONFIG_USE_PRIVATE_LIBGCC=y