config: Enable USB Keyboard support on RPi4

Supporting USB keyboards out of the box is both handy for development
and production. Notably if u-boot is used to boot into GRUB.

Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
[mb: drop rpi_4_32b_defconfig hunk]
Signed-off-by: Matthias Brugger <mbrugger@suse.com>
diff --git a/configs/rpi_4_defconfig b/configs/rpi_4_defconfig
index f641ad3..71f95ed 100644
--- a/configs/rpi_4_defconfig
+++ b/configs/rpi_4_defconfig
@@ -42,6 +42,7 @@
 CONFIG_DM_USB_GADGET=y
 CONFIG_USB_XHCI_HCD=y
 CONFIG_USB_XHCI_PCI=y
+CONFIG_USB_KEYBOARD=y
 CONFIG_USB_GADGET=y
 CONFIG_USB_GADGET_MANUFACTURER="FSL"
 CONFIG_USB_GADGET_VENDOR_NUM=0x0525