KVM: arm64: guest: fix kernel-doc warnings

KVM: arm64: guest: fix kernel-doc warnings

Fix multiple function parameter descriptions to prevent warnings:

guest.c:718: warning: Function parameter or struct member 'vcpu' not described in 'kvm_arm_num_regs'
guest.c:736: warning: Function parameter or struct member 'vcpu' not described in 'kvm_arm_copy_reg_indices'
guest.c:736: warning: Function parameter or struct member 'uindices' not described in 'kvm_arm_copy_reg_indices'
arch/arm64/kvm/guest.c:915: warning: Excess function parameter 'kvm' description in 'kvm_arch_vcpu_ioctl_set_guest_debug'
arch/arm64/kvm/guest.c:915: warning: Excess function parameter 'kvm_guest_debug' description in 'kvm_arch_vcpu_ioctl_set_guest_debug'

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Oliver Upton <oliver.upton@linux.dev>
Cc: James Morse <james.morse@arm.com>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: Zenghui Yu <yuzenghui@huawei.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: kvmarm@lists.linux.dev
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Reviewed-by: Zenghui Yu <yuzenghui@huawei.com>
Link: https://lore.kernel.org/r/20240117230714.31025-3-rdunlap@infradead.org
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>