Update platform file to support 8916 LA 2.0

Change-Id: I25c14e3eed05439fc8f85f4e71261a197898d8bc
Signed-off-by: Sylvain Trosset <trosset.sylvain@gmail.com>
[keithf@codeaurora.org: platform.h Enable scm_call2() for all
targets]
Signed-off-by: Keith Fallows <keithf@codeaurora.org>
Acked-by: Tony Hamilton <tonyh@qti.qualcomm.com>