Fixed * Adapt T2 and C3 CPU templates for kernel 5.10. Firecracker was not previously masking some CPU features of the host or emulated by KVM, introduced in more recent kernels: `umip`, `vmx`, `avx512_vnni`. * Fixed incorrect propagation of init parameters in kernel commandline. Related to: [#2709](https://github.com/firecracker-microvm/firecracker/issues/2709).