ANDROID: build.config.common: Set uname to android13-5.10 instead of android12-5.10

This fixes up the uname reported by the kernel to be
android13-5.10 (matching the branch).

NOTE: This patch depends on the change here to already be merged:
https://android-review.googlesource.com/c/platform/system/libvintf/+/1703726



As without it userland won't boot up properly with android13-5.10 uname.

Bug: 183242632
Signed-off-by: John Stultz <john.stultz@linaro.org>
Change-Id: I84f9c93c3fa738ac2486f57b0a171bd9f085a26a