qseecom: Save appname in qseecom when loading app by kernel client

We've made changes on app session managements to save app name in
qseecom when loading app by userspace client. This change is to save
app name when loading app by kernel client, then qseecom can compare
the app name correctly when sending commands to TZ.

CRs-Fixed: 748491
Change-Id: I341a1a89f0e8a45056be7a5ce0a6a540842bc5dd
Signed-off-by: Zhen Kong <zkong@codeaurora.org>