RISC-V: separate Zbb optimisations requiring and not requiring toolchain support

It seems a bit ridiculous to require toolchain support for BPF to
assemble Zbb instructions, so move the dependency on toolchain support
for Zbb optimisations out of the Kconfig option and to the callsites.

Zbb support has always depended on alternatives, so while adjusting the
config options guarding optimisations, remove any checks for
whether or not alternatives are enabled.

Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Charlie Jenkins <charlie@rivosinc.com>
Reviewed-by: Samuel Holland <samuel.holland@sifive.com>
Link: https://lore.kernel.org/r/20241024-chump-freebase-d26b6d81af33@spud
Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>

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