Use the SYS_INIT() mechanism to invoke the sys_rand32_init() function
in random drivers that require an initializer. Remove all empty
sys_rand32_init() instances.
The existing explicit sys_rand32_init() function runs immediately after
PRE_KERNEL_2 before stack canaries are initialized. In order to get
equivalent behaviour with sys_rand32_init() we set SYS_INIT() to
initialize the random drivers at the lowest priority of PRE_KERNEL_2.
Change-Id: I4521e44daac806bc4eef01ce7fdf2ba5367e0587
Signed-off-by: Marcus Shawcroft <marcus.shawcroft@arm.com>
a715194d43