riscv, bpf: Optimize zextw insn with Zba extension

The Zba extension provides add.uw insn which can be used to implement
zext.w with rs2 set as ZERO.

Signed-off-by: Xiao Wang <[email protected]>
Signed-off-by: Daniel Borkmann <[email protected]>
Tested-by: Pu Lehui <[email protected]>
Reviewed-by: Andrew Jones <[email protected]>
Reviewed-by: Pu Lehui <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]

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