[Cherry-pick] Load native GLES driver when specified.

Since ANGLE and native GLES drivers can coexist, when native is
specified, the loader must load the native GLES drivers specified in
ro.hardware.egl. This patch adds the support to load native GLES drivers
when specified.

Bug: b/283858001
Test: atest CtsAngleDeveloperOptionHostTest -c with ANGLE being default
Test: atest CtsAngleDeveloperOptionHostTest -c with native being default
Change-Id: I85840811d9586bd9f2765b47f3cd1a94c9a8580a
Merged-In: I85840811d9586bd9f2765b47f3cd1a94c9a8580a