Fix generic_x86 image sizes.
Fix generic_x86 image sizes.

The image build tools only accept decimals.

Change-Id: I4fc3d32a9528bdad4cfb9381cff344a1a1b6b6d5

xorware/android_build,ND-3500/platform_manifest,xorware/android_build,xorware/android_build,hagar006/platform_manifest,xorware/android_build,Hybrid-Power/startsync,pranav01/platform_manifest,xorware/android_build,fallouttester/platform_manifest,knone1/platform_manifest,RR-msm7x30/platform_manifest,see4ri/lolili