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bitmap_find_next_zero_area_off requires everything to be given in terms
of bits. genpool no longer keeps track of everything in terms of bits
so the start address must be shifted before passing to
bitmap_find_next_zero_area_off. Without this, if the start address
is unaligned, the code will not take this into account.
Signed-off-by: Laura Abbott <lauraa@codeaurora.org>
(cherry picked from commit e8e5365f74e311f5e0dd2513d3321d081355d308)

Change-Id: I5eca13f181d50e6f9f8f39c7440c6619a8edc69a
Signed-off-by: Sudhir Sharma <sudsha@codeaurora.org>