s5c73m3: only use camera fw from system if newer than on data

if firmware versions from system and data are equal,
firmware from system is used which results in a crash.

<7>[   71.566024] c0 s5c73m3_load_fw: Writing Firmware...
<2>[   71.566095] c0 kernel BUG at /android/cm-10.1/kernel/samsung/smdk4412/arch
/arm/mm/dma-mapping.c:436!
<1>[   71.566145] c0 Unable to handle kernel NULL pointer dereference at virtual
 address 00000000

use firmware from data as workaround for now.

Change-Id: I4df190dee7342bc1db94de285c1ccfa1f05892e8