ANDROID: KVM: arm64: Fix TLB invalidation when coalescing into a block

Wnen coalescing a table into a block, the break-before-make sequence
must invalidate the whole range of addresses translated by the entry in
order to avoid the possibility of a TLB conflict.

Fix the coalescing post-table walker so that the whole range of the old
table is invalidated, rather than just the first address, since a
refcount of 1 on the child page is not sufficient to ensure the absence
of any valid mappings.

Cc: Sebastian Ene <sebastianene@google.com>
Reported-by: Mostafa Saleh <smostafa@google.com>
Fixes: 6b381020 ("ANDROID: KVM: arm64: Coalesce host stage2 entries on ownership reclaim")
Bug: 331232642
Signed-off-by: Will Deacon <willdeacon@google.com>
Change-Id: I4c94f552e4385599ad88b1be50b69ffbafa64a9b