ANDROID: KVM: arm64: Use hyp_alloc for hyp tracing internal struct

By using the hypervisor heap allocator, we can re-use the donation path,
boundary checks and remove the limit on contiguous physical memory. This
means we can now start tracing no matter the fragmentation of the
memory.

Bug: 278749606
Bug: 273748186
Change-Id: I9b544d61a3603519e7f8e97d361bf71ea2d4eba5
Signed-off-by: Vincent Donnefort <vdonnefort@google.com>