Update kernel to builds 6964541

git log --first-parent -100 --oneline --no-decorate 561eb836a30c..ab8a8ffd2fd7:
ab8a8ffd2fd7 ANDROID: scsi: ufs: revise and fix custom keyslot manager support
9bdaa3fa874d ANDROID: vendor_hooks: Add hook for jiffies updates
861a024589b3 ANDROID: clk: Enable writable debugfs files
b8401ecb9a37 ANDROID: enable LLVM_IAS=1 for clang's integrated assembler for aarch64
62015d1c40d3 FROMLIST: Kbuild: do not emit debug info for assembly with LLVM_IAS=1
7aaa29b82b28 ANDROID: printk: add vendor hook for console flush
074a2b36c1b7 ANDROID: Reduce log level for couple of prints in hotplug flow
a0e331ecd324 ANDROID: GKI: Enable CONFIG_RT_SOFTINT_OPTIMIZATION
9889f08de4a1 ANDROID: trace: Add trace points for tasklet entry/exit
1bcefd388369 ANDROID: Revert "softirq: Let ksoftirqd do its job"
ea05d25c786e ANDROID: Revert "Mark HI and TASKLET softirq synchronous"
0578248bedae ANDROID: softirq: defer softirq processing to ksoftirqd if CPU is busy with RT
8d19443b0b9b ANDROID: sched: avoid migrating when softint on tgt cpu should be short
3adfd8e344ac ANDROID: sched: avoid placing RT threads on cores handling softirqs
2c71673913c1 Revert "ANDROID: Kbuild, LLVMLinux: allow overriding clang target triple"
6991ab0b2dc1 ANDROID: Enable hermetic toolchain
2cfc344f813d Merge 5.10-rc3 into android-mainline
aca265111afa ANDROID: fuse: Add support for d_canonical_path
f37e05049bf8 ANDROID: vfs: d_canonical_path for stacked FS
cc47b201a87a ANDROID: GKI: build in a kernel command line of "rw"
3d5e271d109c Merge 521b619acdc8 ("Merge tag 'linux-kselftest-kunit-fixes-5.10-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest") into android-mainline
07933490aec0 Merge 4ef8451b3326 ("Merge tag 'perf-tools-for-v5.10-2020-11-03' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux") into android-mainline
95a43fc99f14 ANDROID: Incremental fs: Add zstd compression support
c4d042a6431b ANDROID: arm: allow hooks into ipi
d458c4f2d189 ANDROID: arm64: allow hooks into ipi
44043ee002fa ANDROID: printk: printk_deferred for modules
bf3d991a7daa ANDROID: sched: Add trace hook for rt throttle dump

Test: treehugger
Bug: 173015758
Change-Id: Ie34b5b017cd6df1eca653f696e933493978490df