RISC-V: fix check for zvkb with tip-of-tree clang

LLVM commit 8e01042da9d3 ("[RISCV] Add missing dependency check for Zvkb
(#79467)") broke the check used by the TOOLCHAIN_HAS_VECTOR_CRYPTO
kconfig symbol because it made zvkb start depending on v or zve*.  Fix
this by specifying both v and zvkb when checking for support for zvkb.

Signed-off-by: Eric Biggers <[email protected]>
Reviewed-by: Nathan Chancellor <[email protected]>
Reviewed-by: Conor Dooley <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Palmer Dabbelt <[email protected]>

Author: ebiggers

arch/riscv/Kconfig

@@ -591,7 +591,7 @@ config TOOLCHAIN_HAS_ZBB
 # extensions, including Zvk*, Zvbb, and Zvbc.  LLVM added all of these at once.
 # binutils added all except Zvkb, then added Zvkb.  So we just check for Zvkb.
 config TOOLCHAIN_HAS_VECTOR_CRYPTO
-	def_bool $(as-instr, .option arch$(comma) +zvkb)
+	def_bool $(as-instr, .option arch$(comma) +v$(comma) +zvkb)
 	depends on AS_HAS_OPTION_ARCH
 
 config RISCV_ISA_ZBB