cim: fix system.kernel_cmdline_arguments() call

Same as commit 6531a0d5d06.
We should use system.kernel_cmdline_arguments() instead of
system.kernel_cmdline_args(). This patch fix the call.

Change-Id: I000a8bde5bfb2a2e492d99151405dc78cdf7c785
Signed-off-by: Douglas Schilling Landgraf <dougsland@redhat.com>