init: remove the restriction of arguments

X86 Kernel could pass CPU capablity to init as argument. This will cause init
can't start first-stage because unknown argument. Need remove this restriction
of arguments to start init successfully.

Fixes: 122435289
Test: Android init can start successfully

Change-Id: I1d432e25553589dd7f618e42ad238b9372dbe34f
Signed-off-by: Haoyu Tang <haoyu.tang@intel.com>
Signed-off-by: Xihua Chen <xihua.chen@intel.com>