Remove OS boot for PowerCapEnable test

"Verify Powercap Disabled By Default" doesn't need to
boot the OS to check if PowerCapEnable is set or not.

Resolves  openbmc/openbmc-test-automation#1151
Signed-off-by: Steven Sombar <ssombar@us.ibm.com>
Change-Id: I91ce6ad0dd97d0f043ebe3ace1e5eeff5b52234d
2 files changed