platform/chrome: cros_ec_debugfs: Fix permissions for panicinfo

platform/chrome: cros_ec_debugfs: Fix permissions for panicinfo

The debugfs_create_blob() function has been used to create read-only binary
blobs in debugfs. The function filters out permissions, other than S_IRUSR,
S_IRGRP and S_IROTH, provided while creating the blobs.

The very behavior though is being changed through previous patch in the
series (fs: debugfs: Add write functionality to debugfs blobs) which makes
the binary blobs writable by owners. Thus, all permissions provided while
creating the blobs, except S_IRUSR,S_IWUSR, S_IRGRP, S_IROTH, will be
filtered by debugfs_create_blob().

As such, rectify the permissions of panicinfo file since the S_IFREG flag
was anyways being filtered out by debugfs_create_blob(). Moreover, the
very flag will always be set be set for the panicinfo file through
__debugfs_create_file().

Signed-off-by: Avadhut Naik <Avadhut.Naik@amd.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>