UVD fails to init on rv790

[K. Schnass]

> Thanks AMD for getting this out :-)
+1

> I have an issue, though.
;( +1

Exactly the same problem but on a RV770! Noticed that the RV710_uvd.bin is 
some 20kb bigger than the RV770 one so maybe that is the problem?

lspci -nnv:
01:00.0 VGA compatible controller [0300]: Advanced Micro Devices [AMD] nee ATI 
RV770 [Radeon HD 4850] [1002:9442] (prog-if 00 [VGA controller])
        Subsystem: PC Partner Limited Device [174b:e104]
        Flags: bus master, fast devsel, latency 0, IRQ 43
        Memory at d0000000 (64-bit, prefetchable) [size=256M]
        Memory at feaf0000 (64-bit, non-prefetchable) [size=64K]
        I/O ports at d000 [size=256]
        Expansion ROM at feac0000 [disabled] [size=128K]
        Capabilities: [50] Power Management version 3
        Capabilities: [58] Express Legacy Endpoint, MSI 00
        Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
        Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1 Len=010 
<?>
        Kernel driver in use: radeon