msm: kgsl: Do LM initialization after GPU is up

LM initialization needs the GX headswitch and SPTPRAC
turned ON. Therefore, move LM initialization toward the end
of GPU boot up sequence because at this point we are sure that
all power is turned ON.

Change-Id: Ia12959b47a2cce5a0653b8c62adb2e17157509f0
Signed-off-by: Harshdeep Dhatt <hdhatt@codeaurora.org>