* gnu/system.scm (bootable-kernel-arguments): Remove 'kernel-arguments'
parameter and return only the base list of kernel arguments. Rename
'system.drv' to 'system'.
(operating-system-kernel-arguments): Adjust accordingly and remove
'system.drv' parameter.
(read-boot-parameters-file): Adjust accordingly. Remove 'if params'
since dominating code assumed PARAMS is always true.
(operating-system-boot-parameters): Remove 'system.drv' parameter; add
#:system-kernel-arguments? instead and honor it.
(operating-system-bootcfg): Adjust accordingly.
(operating-system-boot-parameters-file): Likewise.
* gnu/system/vm.scm (system-qemu-image/shared-store-script): Remove
'os-drv' variable. Adjust call to 'operating-system-kernel-arguments'.
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