ANDROID: Fix compilation error with huge_pmd_share()

There was an asterisk missing for one of the function parameters in the
upstreamed patch.

Fixes: e8ba376301a36 ("BACKPORT: FROMGIT: hugetlb: pass vma into
huge_pte_alloc() and huge_pmd_share()")

Signed-off-by: Lokesh Gidra <lokeshgidra@google.com>
Bug: 160737021
Bug: 169683130
Change-Id: I110563bc38e60a829fe7808f69dc0aa0f203a50e