HID: amd_sfh: rename float_to_int() to amd_sfh_float_to_int()

Current amd_sfh driver has float_to_int() to convert units from
float to int. This is fine until this function gets called outside of
the current scope of file.

Add a prefix "amd_sfh" to float_to_int() so that function represents
the driver name. This function will be called by multiple callers in the
next patch.

Link: https://lore.kernel.org/all/ad064333-48a4-4cfa-9428-69e8a7c44667@redhat.com/


Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Co-developed-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
Signed-off-by: Basavaraj Natikar <Basavaraj.Natikar@amd.com>
Signed-off-by: Jiri Kosina <jkosina@suse.com>