soc: qcom: pil: Ensure imem is initialized prior to use

Currently, imem is being referenced prior to being initialized,
which causes the imem area to not be written to. Move imem
initialization further up in the init call chain to ensure
that it is initialized before use.

Change-Id: I40fd6df77ffb0771858e168a925ed7ebeeb1ba1e
Signed-off-by: Isaac J. Manjarres <isaacm@codeaurora.org>