1. RAS error injection debugfs interface has been changed which
is using ras_ctrl instead of *_err_inject.
2. Remove ASSERT_SUCCESS for fwrite, because fwrite returns
the size of written item but not the error number.
3. Using throw exception instead of return to avoid a segment fault.
Change-Id: I6c4d9c2f7e66719faec99abd1552105a08c238a4
Signed-off-by: Eric Huang <JinhuiEric.Huang@amd.com>