default: Use ti-android-15 for kmgk

Kmgk needed a fix [1] in order to be able to build with
PRODUCT_SHIPPING_API_LEVEL := 35

Update the project's revision so that we get the fix included for ti-android-15.

[1] baylibre/ti/android/aosp/external/kmgk!13


Signed-off-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>