BACKPORT: bpf: add bpf_ktime_get_boot_ns()

On a device like a cellphone which is constantly suspending
and resuming CLOCK_MONOTONIC is not particularly useful for
keeping track of or reacting to external network events.
Instead you want to use CLOCK_BOOTTIME.

Hence add bpf_ktime_get_boot_ns() as a mirror of bpf_ktime_get_ns()
based around CLOCK_BOOTTIME instead of CLOCK_MONOTONIC.

Change-Id: I7b70d785eb8bd5237724ed7c5dc32e99ec51c1fc
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
(cherry picked from commit 71d19214776e61b33da48f7c1b46e522c7f78221)
Git-commit: 34073d7a
Git-repo: https://android.googlesource.com/kernel/common


Signed-off-by: Sharath Chandra Vurukala <quic_sharathv@quicinc.com>
(cherry picked from commit 6dc0a859)