ANDROID: MTK: build: restricted: fix incremental builds
When running multiple incremental builds, we can see: make: Leaving directory '/mnt/5c26050c-a7ac-42ba-a6e4-2bfe27686c4b/mediatek/src/rita-5.10-kernel/mt7663-wifi-mod' ++ set +x mkdir: '/mnt/5c26050c-a7ac-42ba-a6e4-2bfe27686c4b/mediatek/src/rita-5.10-kernel/out/android12-5.10/kernel-restricted': File exists
This aborts the build, so DIST_DIR stays empty afterwards.
Fix it by telling mkdir that it's OK if the folder already exists (use -p)
Signed-off-by: Mattijs Korpershoek mkorpershoek@baylibre.com