Don't make assumptions about the formats of build descriptions

Change-Id: Id83a7594e9e1b9b4ffbdbaba695506d8d0d21a46
Kernel : Use Linaro 4.7.4 Toolchain

Change-Id: Iac0e1deb2f030b283c9dc858d290552b345d4689
Kernel : Use Linaro 4.8.2 Toolchain

Change-Id: I25f67548af4244c20179437ad4ee0c68aaf8213a