soc: qcom: pil: Clear elf memory on validation failure

Clear memory where elf segments are loaded if any of the segments fail
authentication.

CRs-Fixed: 1113126
Change-Id: I85d6bdc8efbb5738a863e59c0244222defcc1bcb
Signed-off-by: Puja Gupta <pujag@codeaurora.org>
Signed-off-by: Satya Durga Srinivasu Prabhala <satyap@codeaurora.org>