dri: add dri_dlopen and dri_dlclose

They will be used for preloading.

BUG=b:269664560
TEST="grep radeonsi /proc/$(pidof zygote)/maps" on grunt

Change-Id: I6134e00bf9e046889aea7e471b7f7bcf3972604c
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/minigbm/+/4262033
Reviewed-by: Yiwei Zhang <[email protected]>
Commit-Queue: Chia-I Wu <[email protected]>
Tested-by: Chia-I Wu <[email protected]>
2 files changed