mips: bmips: add nb4-ser usb support

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
diff --git a/configs/sfr_nb4-ser_ram_defconfig b/configs/sfr_nb4-ser_ram_defconfig
index ae25fc9..f2031df 100644
--- a/configs/sfr_nb4-ser_ram_defconfig
+++ b/configs/sfr_nb4-ser_ram_defconfig
@@ -25,6 +25,7 @@
 # CONFIG_CMD_CRC32 is not set
 CONFIG_CMD_MEMINFO=y
 # CONFIG_CMD_LOADS is not set
+CONFIG_CMD_USB=y
 # CONFIG_CMD_MISC is not set
 CONFIG_OF_EMBED=y
 # CONFIG_NET is not set
@@ -37,8 +38,16 @@
 CONFIG_MTD=y
 CONFIG_MTD_NOR_FLASH=y
 CONFIG_CFI_FLASH=y
+CONFIG_PHY=y
+CONFIG_BCM6358_USBH_PHY=y
 CONFIG_DM_RESET=y
 CONFIG_RESET_BCM6345=y
 # CONFIG_SPL_SERIAL_PRESENT is not set
 CONFIG_DM_SERIAL=y
 CONFIG_BCM6345_SERIAL=y
+CONFIG_USB=y
+CONFIG_DM_USB=y
+CONFIG_USB_EHCI_HCD=y
+CONFIG_USB_EHCI_GENERIC=y
+CONFIG_USB_OHCI_HCD=y
+CONFIG_USB_OHCI_GENERIC=y