ARM: dts: msm: Update the clock header file for MSM8992

Until now the clock header file being used was the same across
MSM8994 and MSM8992. However, MSM8992 does not have some of the
clocks present on MSM8994. Hence, create a new MSM8992 specific
clock header file.

Change-Id: If03059647778050179e33ee9ad14e353ac1c3764
Signed-off-by: Pushkar Joshi <pushkarj@codeaurora.org>