defconfig: am335x_boneblack_vboot: enable timer driver model

Enable timer driver model for am335x_boneblack_vboot as
omap-timer supports driver model.

Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/am335x_boneblack_vboot_defconfig b/configs/am335x_boneblack_vboot_defconfig
index 5dcb942..060aa1c 100644
--- a/configs/am335x_boneblack_vboot_defconfig
+++ b/configs/am335x_boneblack_vboot_defconfig
@@ -22,3 +22,5 @@
 CONFIG_SPI_FLASH_WINBOND=y
 CONFIG_DM_ETH=y
 CONFIG_SYS_NS16550=y
+CONFIG_TIMER=y
+CONFIG_OMAP_TIMER=y