Build error at EGL1.5 non support platform

In this patch https://gerrit.automotivelinux.org/gerrit/c/AGL/AGL-repo/+/28971, that update meta-flutter in AGL master.
After that, a flutter-auto cause build error in R-CarH3 ref-hw environment.

The ivi-homescreen is using eglGetPlatformDisplay directly that possible to use in EGL version is 1.5 or greater.   On the other hand R-CarH3/M3 is not supporting EGL version is 1.5, only a EGL version is 1.4.  This situation cause build error in R-Car H3/M3.