platform/x86: ideapad-laptop: Use __func__ instead of write_ec_cmd in pr_err

Address the following  checkpatch warning by using __func__ instead:
WARNING: Prefer using '"%s...", __func__' to using 'write_ec_cmd',
this function's name, in a string

Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Darren Hart (VMware) <dvhart@infradead.org>