lantiq: Fixed brnImage signature for the VGV7510KW22BRN images

The old signature only worked because brnboot ignores the leading "5" in
the signature. We can see the correct signature when flashing a brnImage
via recovery web-interface, in this case brnboot reports:
	[CGI-Signature Check] buf:[BRNDA6431], sigInFlash:[BRNDA6431]

Thanks to Mathias Kresin for reporting this.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>

SVN-Revision: 48269

target/linux/lantiq/image/Makefile

@@ -417,7 +417,7 @@ Image/BuildKernel/Profile/VGV7510KW22NOR=$(call Image/BuildKernel/Template,VGV75
 Image/Build/Profile/VGV7510KW22NOR=$(call Image/Build/$(1),$(1),VGV7510KW22NOR)
 
 Image/BuildKernel/Profile/VGV7510KW22BRN=$(call Image/BuildKernel/Template,VGV7510KW22BRN,$(1))
-Image/Build/Profile/VGV7510KW22BRN=$(call Image/Build/$(1),$(1),VGV7510KW22BRN,5BRNDA6431,0x12345678,0x04c11db7,$(1))
+Image/Build/Profile/VGV7510KW22BRN=$(call Image/Build/$(1),$(1),VGV7510KW22BRN,BRNDA6431,0x12345678,0x04c11db7,$(1))
 
 Image/BuildKernel/Profile/VGV7519NOR=$(call Image/BuildKernel/Template,VGV7519NOR,$(1))
 Image/Build/Profile/VGV7519NOR=$(call Image/Build/$(1),$(1),VGV7519NOR)