egl: fix EGL_EXT_protected_content/surface mixup

EGL_EXT_protected_surface introduces EGL_PROTECTED_CONTENT_EXT,
while EGL_EXT_protected_content is about protected context.

When I implemented EGL_EXT_protected_surface I mixed up the 2
names, so this commit fixes it.

Fixes: bd182777c8f ("egl: implement EGL_EXT_protected_surface support")
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8122>
(cherry picked from commit 663e06faa62c3e1a0e9b4e9a584ef6fb832c2cf8)
6 files changed