lisa/_assets/kmodules/lisa: Check return value of kernel_write() and fix typo __worqueue

[New MR instead of https://gitlab.arm.com/tooling/lisa/-/merge_requests/2340 to check if GitLab actions work fine]

• Fix typo __worqueue: It should be __workqueue instead.
• Check return value of kernel_write(): kernel_write() may fail since check its return value to ease debugging exceptions in pixel6.c. While we are here, fix some trivial whitespacing issues.

Tested changes with a notebook which uses pixel6_emeter.

Thanks,