pfk: add changes for clear key support

Add support for clearing FBE key and all it's
corresponding data from kernel, trustzone and ICE
when a user is locked or deleted.

Change-Id: I0c1afc1a7fcf2e76cd8e268fea31e68d2efe0130
Signed-off-by: Shivaprasad Hongal <shongal@codeaurora.org>