keymaster: Add msm8974 archtecture and use TARGET_BOARD_PLATFORM

Change-Id: I8e5cf1baf96c4bc4669a5cb4a77697dbe59f390c
keymaster: Add support for enabling CE clks

Before issuing a call to keymaster secure app, that
require accessing the CE HW,  clks needs to  be enabled.
Invoking QSEECom_set_bandwidth() before issuign the
command does this enabling of CE clks

Change-Id: I8f881be600223d4a8e3c098c93ec8b12a88a3850
keymaster: Enable compilation for msm8226 based platforms

Enable keymaster for msm8226.

Change-Id: Ibd8b0e935f01986c2920f75e04671413817ea980
Merge tag 'android-4.4_r1' into kitkat

Android 4.4 Release 1.0