ion: msm: remove superfluous function argument

msm_ion_client_create doesn't actually do anything with its heap_mask
parameter. Remove it. Also remove the extra argument from an audio
function that wraps msm_ion_client_create.

The following semantic patch was used to generate this patch:

    @@
    expression E1, E2;
    @@

    msm_ion_client_create(
    -       E1,
            E2)

    @@
    expression E1, E2;
    @@

    msm_audio_ion_client_create(
    -       E1,
            E2)

Change-Id: I5dfcc105431c023882747ad7fc3112e41f7f4528