Revert "native: Fix QCOM_BSP_LEGACY cflags"

* This is unnecessary now that the flags are set in the build makefile

This reverts commit 7c38f6bf2fd19214146788f5b5b8cd587fa972fb.

Change-Id: I5c1042b762f84455c888bafe56c5a619952bfbba
frameworks/native: Remove unnecessary QCOM_BSP defines

* This is already provided by the build makefiles

Change-Id: I630f09850f6f66c8f3c501fa5fd78f5a15a3436f