mailbox: qcom-apcs-ipc: Consolidate msm8994 type apcs_data

The msm8994 type of apcs_data is defined multiple times with different
SoC name encoded.  Consolidate them on msm8994 and remove the data
duplication.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>