Add CIP Kernel configuration support
## Issue description CIP support is driven by the configurations defined in the cip-kernel-config repository. Currently KernelCI uses the in-tree defconfig, plus various config fragments when configuring the Linux kernel. CIP would like to change this to use the configurations defined in cip-kernel-config. Specifically we'd like to test with the "merged" configs that have been created; one for each architecture, e.g. [6.1.y-cip/arm64/cip_merged_defconfig](https://gitlab.com/cip-project/cip-kernel/cip-kernel-config/-/blob/master/6.1.y-cip/arm64/cip_merged_defconfig) ## Useful links * [cip-kernel-config](https://gitlab.com/cip-project/cip-kernel/cip-kernel-config) ## Acceptance criteria - [ ] Each cip_merged_defconfig in cip-kernel-config is converted into a .config fragment derived from the relevant in-tree defconfig - [ ] KernelCI uses defconfig plus the correct kernel config fragment (version & arch) when building the CIP tree
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