riscv: cpufeature: Extract common elements from extension checking

The __riscv_has_extension_likely() and __riscv_has_extension_unlikely()
functions from the vendor_extensions.h can be used to simplify the
standard extension checking code as well. Migrate those functions to
cpufeature.h and reorganize the code in the file to use the functions.

Signed-off-by: Charlie Jenkins <[email protected]>
Reviewed-by: Conor Dooley <[email protected]>
Reviewed-by: Andy Chiu <[email protected]>
Link: https://lore.kernel.org/r/20240719-support_vendor_extensions-v3-4-0af7587bbec0@rivosinc.com
Signed-off-by: Palmer Dabbelt <[email protected]>

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