ARM: dts: msm: Fix the actuator-type for PMI8950/40 haptics

The actuator-type expects values of 0 (LRA) and 1(ERM)
instead of strings. Fix it.

Change-Id: If922b06448138107d5c797f35d2835b20a490ade
Signed-off-by: Anirudh Ghayal <aghayal@codeaurora.org>