KVM: arm64: vgic-its: fix kernel-doc warnings

Correct the function parameter name "@save tables" -> "@save_tables".
Use the "typedef" keyword in the kernel-doc comment for a typedef.

These changes prevent kernel-doc warnings:

vgic/vgic-its.c:174: warning: Function parameter or struct member 'save_tables' not described in 'vgic_its_abi'
arch/arm64/kvm/vgic/vgic-its.c:2152: warning: expecting prototype for entry_fn_t(). Prototype was for int() instead
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/20240117230714.31025-10-rdunlap@infradead.orgSigned-off-by: Oliver Upton <oliver.upton@linux.dev>

arch/arm64/kvm/vgic/vgic-its.c

@@ -158,7 +158,7 @@ struct vgic_translation_cache_entry {
  * @cte_esz: collection table entry size
  * @dte_esz: device table entry size
  * @ite_esz: interrupt translation table entry size
- * @save tables: save the ITS tables into guest RAM
+ * @save_tables: save the ITS tables into guest RAM
  * @restore_tables: restore the ITS internal structs from tables
  *  stored in guest RAM
  * @commit: initialize the registers which expose the ABI settings,
@@ -2139,7 +2139,7 @@ static u32 compute_next_eventid_offset(struct list_head *h, struct its_ite *ite)
 }
 
 /**
- * entry_fn_t - Callback called on a table entry restore path
+ * typedef entry_fn_t - Callback called on a table entry restore path
  * @its: its handle
  * @id: id of the entry
  * @entry: pointer to the entry