mpq8092: remove unnecessary compatible strings

dts files will be compiled base on the makefile entries
in arch/arm/dts.
remove unnecessary device tree compatible match strings.
"qcom,mpq8092" will take care of matching for all platforms.

Change-Id: Ic010b62a387be7235d96ea12efb934245a4b0948
Signed-off-by: Srinivas Ramana <sramana@codeaurora.org>