drivers: misc: Drop depends on MSM_SMD

There isn't any need to depend on MSM_SMD here as the code builds
fine without it enabled. This silences a kconfig warning about
missing a dependency that we clearly don't need.

Change-Id: I35da552c68a39e117672e60efa3da7e46da77850
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>