arduino-uno-q: install USB gadget scripts unconditionally in BSP

The BSP package is built once per board+branch and cached across all
distributions. Conditioning the installation on DISTRIBUTION inside a
post_family_tweaks_bsp__ hook causes the CI to cache a BSP built for
Debian (without gadget files), then reuse it for Ubuntu builds where
systemctl enable usbgadget-rndis.service fails because the service
file is missing.

Install the files unconditionally in the BSP and keep the service
enablement conditional in post_family_tweaks__ where DISTRIBUTION
can be reliably checked per-image.

Author: SuperKali

config/boards/arduino-uno-q.csc

@@ -41,7 +41,8 @@ function post_family_tweaks__arduino-uno-q() {
 }
 
 function post_family_tweaks_bsp__arduino-uno-q_usb_gadget() {
-	[[ "${DISTRIBUTION}" != "Ubuntu" ]] && return 0
+	# BSP is built once and cached across distros, so install files unconditionally.
+	# The usbgadget-rndis service is enabled in post_family_tweaks__ only when adbd is unavailable.
 	display_alert "Installing USB gadget network scripts" "${BOARD}" "info"
 	install -Dm755 "$SRC/packages/bsp/usb-gadget-network/setup-usbgadget-network.sh" "$destination/usr/local/bin/setup-usbgadget-network.sh"
 	install -Dm755 "$SRC/packages/bsp/usb-gadget-network/remove-usbgadget-network.sh" "$destination/usr/local/bin/remove-usbgadget-network.sh"