Support ETC1 compressed texture

ETC1 texture is compatible with ETC2 texture. We support ETC2 texture
already so it doesn't hurt to add support for ETC1.

Test: manual

Change-Id: If85b84610df4302cfdf03f60888a97f36a77a523
diff --git a/system/GLESv2_enc/GLESv2Validation.cpp b/system/GLESv2_enc/GLESv2Validation.cpp
index f736e23..098091f 100644
--- a/system/GLESv2_enc/GLESv2Validation.cpp
+++ b/system/GLESv2_enc/GLESv2Validation.cpp
@@ -785,6 +785,7 @@
     f(GL_DEPTH_COMPONENT32F) \
     f(GL_DEPTH24_STENCIL8) \
     f(GL_DEPTH32F_STENCIL8) \
+    f(GL_ETC1_RGB8_OES) \
     f(GL_COMPRESSED_R11_EAC) \
     f(GL_COMPRESSED_SIGNED_R11_EAC) \
     f(GL_COMPRESSED_RG11_EAC) \