ANDROID: KVM: arm64: iommu: Use same type for kernel/hyp

Although hyp_spinlock_t and u32 have the same size, that makes the build
system duplicate the type for EL1/EL2 builds impacting KMI.

Use a single type for lock, and cast it when used at EL2.

Bug: 350677978
Bug: 357781595
Bug: 384432312
Change-Id: I13b7330dcf5c5340e3bad35eab9808388e9a84a3
Signed-off-by: Mostafa Saleh <smostafa@google.com>

include/kvm/iommu.h

@@ -5,9 +5,6 @@
 #include <asm/kvm_host.h>
 #include <kvm/power_domain.h>
 #include <linux/io-pgtable.h>
-#ifdef __KVM_NVHE_HYPERVISOR__
-#include <nvhe/spinlock.h>
-#endif
 
 /*
  * Domain ID for identity mapped domain that the host can attach
@@ -58,11 +55,7 @@ extern void **kvm_nvhe_sym(kvm_hyp_iommu_domains);
 	(1 << get_order(KVM_IOMMU_DOMAINS_ROOT_SIZE))
 
 struct kvm_hyp_iommu {
-#ifdef __KVM_NVHE_HYPERVISOR__
-	hyp_spinlock_t			lock;
-#else
-	u32				unused;
-#endif
+	u32				lock;   /* lock size verified in kvm_iommu_get_lock.  */
 	struct kvm_power_domain		power_domain;
 	bool				power_is_off;
 	ANDROID_KABI_RESERVE(1);