Memset ext_ctl and v4l2_ctls structure values to 0 before processing it. If
not set, unassigned values can have garbage values and that can lead to
functional/feature failure.

CRs-Fixed: 1091284
Change-Id: Ice666cddd8e734d2d91053c30c42493315292841

FM kernel driver can return zero or positive
values in case of success. Make changes to treat
only negative return values as errors.

Change-Id: Ief859af604349a2e47daee18693723600154d1a9

FM kernel driver can return zero or positive
values in case of success. Make changes to treat
only negative return values as errors.

Change-Id: Ief859af604349a2e47daee18693723600154d1a9

Add apis to configure fm performance related parameters.

CRs-Fixed: 671803
Change-Id: I37565c21a731023e42372be71fb28edc30154672