RISC-V: KVM: Remove 's' & 'u' as valid ISA extension

There are no ISA extension defined as 's' & 'u' in RISC-V specifications.
The misa register defines 's' & 'u' bit as Supervisor/User privilege mode
enabled. But it should not appear in the ISA extension in the device tree.

Remove those from the allowed ISA extension for kvm.

Fixes: a33c72f ("RISC-V: KVM: Implement VCPU create, init and
destroy functions")
Signed-off-by: Atish Patra <atishp@rivosinc.com>
Signed-off-by: Anup Patel <anup@brainfault.org>

Author: atishp04

arch/riscv/kvm/vcpu.c

@@ -43,9 +43,7 @@ const struct kvm_stats_header kvm_vcpu_stats_header = {
 				 riscv_isa_extension_mask(d) | \
 				 riscv_isa_extension_mask(f) | \
 				 riscv_isa_extension_mask(i) | \
-				 riscv_isa_extension_mask(m) | \
-				 riscv_isa_extension_mask(s) | \
-				 riscv_isa_extension_mask(u))
+				 riscv_isa_extension_mask(m))
 
 static void kvm_riscv_reset_vcpu(struct kvm_vcpu *vcpu)
 {