BoardConfig.mk: Add more EGL Flags for HWC and OMX Codecs

Requres :
	https://gerrit.omnirom.org/#/c/4462
	https://gerrit.omnirom.org/#/c/4492
	https://gerrit.omnirom.org/#/c/4503

Change-Id: I5904f39b7f00e253a14a5ed81d41fee2918f1b67
Add Some filesystem configs and some overlays

Change-Id: Icea564b59bcccd05ef81d6b2acfdbaa87db7c409