Revert legacy egl hacks

  * As far as I know none of these are  needed now.

Revert "hax: Split the exynos4/tegra legacy code paths"

This reverts commit 77b4b5cb0cd636dd1ea8546266cdbf2ca2801320.

Revert "DisplayDevice: Backwards compatibility with old EGL"

This reverts commit ebba634a0774239c27d46faa0d5a974da21f3d31.

Conflicts:
	services/surfaceflinger/Android.mk

Revert "Rework BOARD_EGL_NEEDS_LEGACY_FB implementation"

This reverts commit 35b7dd9b6b1df3622cf123ce307b45e9f0f49568.

Change-Id: I6da0d21533c24e512cf3a466477d2261258ba893
Signed-off-by: Josue Rivera <prbassplayer@gmail.com>

Conflicts:
	libs/gui/Android.mk