epicmtd: remove unused ARCH_ARM_HAVE_TLS_REGISTER

The variable is no longer used by the Android build system.

Change-Id: I412f8831c7f47f55a59b2e2d52d6606883f3df3a
epicmtd: set ro.bq.gpu_to_cpu_unsupported

This tells SurfaceFlinger to always use the CPU
pipeline for taking screenshot. We don't actually need
this since our surface type isn't supported by Bitmap
and will defaults to CPU anyway, but setting it doesn't
hurt.

Change-Id: I2a329e48db385a1597afa28d18eb6152b49a34cc