ANDROID: fix abi break in 4.19.284 for cpuhotplug.h

Commit 59842a9b ("firmware: arm_sdei: Fix sleep from invalid context
BUG") removed an entry from the cpuhp_state enum, which breaks the
Android KABI.  So put the entry back, it's ok if no one is using it
anymore, this preserves the ABI, so all is good.

Bug: 161946584
Change-Id: Ief4264e31a27983254ae0e2937df8198f0af59c5
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Fixes: 59842a9b ("firmware: arm_sdei: Fix sleep from invalid context BUG")