msm: scm: Mark scm_call_atomic*() return value as signed
scm_call_atomic*() can return a negative 32 bit value indicating
an error. Change the function signature to indicate that this is
possible.
Change-Id: I633bb521410f9a07495ec5e73e3a8b0e9adb7af1
Signed-off-by:
Stephen Boyd <sboyd@codeaurora.org>
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