efi: Enable DM_ETH for the app

There is no need to avoid driver model for networking. Drop this.
Signed-off-by: NSimon Glass <sjg@chromium.org>
Reviewed-by: NHeinrich Schuchardt <xypron.glpk@gmx.de>

configs/efi-x86_app_defconfig

@@ -32,7 +32,6 @@ CONFIG_ENV_OVERWRITE=y
 CONFIG_SYS_RELOC_GD_ENV_ADDR=y
 CONFIG_REGMAP=y
 CONFIG_SYSCON=y
-# CONFIG_DM_ETH is not set
 # CONFIG_REGEX is not set
 # CONFIG_GZIP is not set
 CONFIG_EFI=y