kernel: Use libc sysroot from host for 6.11+

Linux kernel 6.11 has removed support for old libc versions by commit
[1]. The commit message implies it's done as part of retiring
RHEL/CentOS 7, CentOS 7 includes glibc 2.17, All glibc available from
AOSP are NOT newer than that version.

Before there's a better solution, use libc sysroot from host.

[1]: https://github.com/torvalds/linux/commit/3914cdde89c29b681e73e507a04ca50f147482a3

Change-Id: I9210a9b4742304214d90f7d319b06167f0508052