Enable USB serial adapter support for GFHD254.

Change-Id: I835a5f1ae6b6c2fd04ab3649f9a6fa81720d5d81
diff --git a/arch/arm/configs/bruno_gfhd254_defconfig b/arch/arm/configs/bruno_gfhd254_defconfig
index 353b5a4..80e3b00 100644
--- a/arch/arm/configs/bruno_gfhd254_defconfig
+++ b/arch/arm/configs/bruno_gfhd254_defconfig
@@ -185,6 +185,10 @@
 CONFIG_USB_EHCI_HCD=y
 CONFIG_USB_OHCI_HCD=y
 CONFIG_USB_STORAGE=y
+CONFIG_USB_SERIAL=y
+CONFIG_USB_SERIAL_FTDI_SIO=y
+CONFIG_USB_SERIAL_KEYSPAN=y
+CONFIG_USB_SERIAL_PL2303=y
 CONFIG_MMC=y
 CONFIG_MMC_BLOCK_MINORS=16
 CONFIG_MMC_SDHCI=y