defconfig: Enable Microchip USB to ethernet adapter drivers for QCS605

Enable CONFIG_USB_LAN78XX to support host mode USB to
ethernet Micropchip ethernet adapters.

Change-Id: I3f83b5e1d770a2c8eddda657c25f0fec207fc01d
Signed-off-by: Sriharsha Allenki <sallenki@codeaurora.org>
diff --git a/arch/arm64/configs/sdm670_defconfig b/arch/arm64/configs/sdm670_defconfig
index 3e8d865..e295330 100644
--- a/arch/arm64/configs/sdm670_defconfig
+++ b/arch/arm64/configs/sdm670_defconfig
@@ -293,6 +293,7 @@
 CONFIG_PPPOPNS=y
 CONFIG_PPP_ASYNC=y
 CONFIG_PPP_SYNC_TTY=y
+CONFIG_USB_LAN78XX=y
 CONFIG_USB_USBNET=y
 CONFIG_WCNSS_MEM_PRE_ALLOC=y
 CONFIG_CLD_LL_CORE=y