target/riscv/kvm: minor fixes/tweaks

target/riscv/kvm: minor fixes/tweaks

Remove an unused 'KVMScratchCPU' pointer argument in
kvm_riscv_check_sbi_dbcn_support().

Put kvm_riscv_reset_regs_csr() after kvm_riscv_put_regs_csr(). This will
make a future patch diff easier to read, when changes in
kvm_riscv_reset_regs_csr() and kvm_riscv_get_regs_csr() will be made.

Fixes: a6b53378f5 ("target/riscv/kvm: implement SBI debug console (DBCN) calls")
Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-ID: <20250429124421.223883-2-dbarboza@ventanamicro.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Cc: qemu-stable@nongnu.org
(cherry picked from commit 73f81da0a3628180409a0ae90ece19534bcdf09b)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>