power: smb5-lib: fix SMB EN override handling

SMB EN override is configure from multiple entry points,
use voting mechanism to control SMB EN override.

Updated patch to address an uninitialized variable warning.

Change-Id: I4b8ec3a74a74d1cd1a7569652a5f9aafc1f978ad
Signed-off-by: Ashay Jaiswal <ashayj@codeaurora.org>
Signed-off-by: Guru Das Srinagesh <gurus@codeaurora.org>