x86: kconfig: Imply DM uclass drivers

Now that all x86 boards have been converted to use DM, we can imply
these uclass drivers (DM_ETH, DM_RTC, DM_USB, DM_VIDEO) from the
top level.

Previously DM_GPIO, DM_KEYBOARD, DM_SERIAL, DM_SPI, DM_SPI_FLASH
are selected. Change to use 'imply' to allow them to be removed.

Note with this change, chromebook_link64 build fails:

common/built-in.o:(.data.env_htab+0xc): undefined reference to 'env_flags_validate'
lib/built-in.o: In function `hsearch_r':
lib/hashtable.c:380: undefined reference to 'env_callback_init'
lib/hashtable.c:382: undefined reference to 'env_flags_init'
make[1]: *** [spl/u-boot-spl] Error 1

CONFIG_SPL_ENV_SUPPORT is required for chromebook_link64 to build
again. This is just a workaround as it is not needed at all. See
commit bda40d5 "x86: qemu: Add a config for 64-bit U-Boot" for
the same issue seen on QEMU 64-bit target.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/configs/chromebook_link64_defconfig b/configs/chromebook_link64_defconfig
index d418db9..ab01909 100644
--- a/configs/chromebook_link64_defconfig
+++ b/configs/chromebook_link64_defconfig
@@ -22,6 +22,7 @@
 CONFIG_SYS_CONSOLE_INFO_QUIET=y
 CONFIG_SPL_SYS_MALLOC_SIMPLE=y
 CONFIG_SPL_CPU_SUPPORT=y
+CONFIG_SPL_ENV_SUPPORT=y
 CONFIG_SPL_I2C_SUPPORT=y
 CONFIG_SPL_NET_SUPPORT=y
 CONFIG_SPL_PCI_SUPPORT=y
@@ -68,17 +69,14 @@
 CONFIG_SPI_FLASH_GIGADEVICE=y
 CONFIG_SPI_FLASH_MACRONIX=y
 CONFIG_SPI_FLASH_WINBOND=y
-CONFIG_DM_RTC=y
 CONFIG_DEBUG_UART_BASE=0x3f8
 CONFIG_DEBUG_UART_CLOCK=1843200
 CONFIG_DEBUG_UART_BOARD_INIT=y
 CONFIG_SYS_NS16550=y
 CONFIG_ICH_SPI=y
 CONFIG_TPM_TIS_LPC=y
-CONFIG_DM_USB=y
 CONFIG_USB_STORAGE=y
 CONFIG_USB_KEYBOARD=y
-CONFIG_DM_VIDEO=y
 CONFIG_VIDEO_VESA=y
 CONFIG_FRAMEBUFFER_SET_VESA_MODE=y
 CONFIG_FRAMEBUFFER_VESA_MODE_11A=y