Revert "libstagefright: Fix QCOM_BSP_LEGACY cflags"

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

This reverts commit 965f5389194fe9922ddea75564ea72e4fba39f96.

Change-Id: I7b849bf2b8442b576d1c2bee26795ffdb90581b1
stagefright: Remove unnecessary QCOM_BSP flag

* Already provided by build makefile

Change-Id: Ica244932f82c93e0f883c603261d16c764a375f1