bpf: Factor out htab_elem_value helper()

All hash maps store map key and map value together. The relative offset
of the map value compared to the map key is round_up(key_size, 8).
Therefore, factor out a common helper htab_elem_value() to calculate the
address of the map value instead of duplicating the logic.

Acked-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Hou Tao <houtao1@huawei.com>
Link: https://lore.kernel.org/r/20250401062250.543403-2-houtao@huaweicloud.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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