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/minnowmax_defconfig b/configs/minnowmax_defconfig
index 37c07c1..864fd1b 100644
--- a/configs/minnowmax_defconfig
+++ b/configs/minnowmax_defconfig
@@ -32,6 +32,7 @@
 CONFIG_DEBUG_UART_CLOCK=1843200
 CONFIG_SYS_NS16550=y
 CONFIG_ICH_SPI=y
+CONFIG_TIMER=y
 CONFIG_USB=y
 CONFIG_DM_USB=y
 CONFIG_VIDEO_VESA=y