scmi: Fix violation of required MISRAC 2012 rule 9.5

Violations of MISRAC 2012 rule 9.5 related to scmi files are
fixed in this patch.

The array size for some designated initializer were missing.
Thus, added array sizes for array initializers.

Signed-off-by: Tuvshinzaya Erdenekhuu <tuvshinzaya.erdenekhuu@arm.com>
Change-Id: I5132870b0d9a40d2780a0aa96f5f5d4b12cd3cbf