defconfig: am335x_gp_evm: enable timer driver model

Enable timer driver model for am335x_gp_evm 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_gp_evm_defconfig b/configs/am335x_gp_evm_defconfig
index 74d9ffb..49461e2 100644
--- a/configs/am335x_gp_evm_defconfig
+++ b/configs/am335x_gp_evm_defconfig
@@ -16,3 +16,5 @@
 CONFIG_DM_ETH=y
 CONFIG_SYS_NS16550=y
 CONFIG_RSA=y
+CONFIG_TIMER=y
+CONFIG_OMAP_TIMER=y