arch:arm: msm: removed not needed device trees

LA.BR.1.2.4 are limited in the boot partition. In order to expand the
boot.img and recovery.img memory removed not needed DTBs from the Makefile.
Change-Id: I2fbb8dab0feeaa3322cbe770f7666970676aaf85
Signed-off-by: Tanya Finkel <tfinkel@codeaurora.org>
Signed-off-by: Sridhar Gujje <sgujje@codeaurora.org>