When user specifies GL_MAP_PERSISTENT_BIT_EXT bit for an external
buffer but we are unable to import it into a memoryType that supports
host visibility, error out with GL_INVALID_OPERATION error.

Bug: angleproject:5073
Bug: angleproject:5909
Change-Id: I03e5477266dfb705bfb0a1bce5ca003049ef4c7a
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2862560
Commit-Queue: Mohan Maiya <m.maiya@samsung.com>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>