libdrm: Upgrade to 2.4.120

libdrm: Upgrade to 2.4.120

Upgrade to 2.4.120 which has the following changes:

Eric Engestrom (1):
      radeon: fix missing stencil_tile_mode initialisation in the linear/fallback case

Pierre-Eric Pelloux-Prayer (1):
      amdgpu: fix use-after-free

Simon Ser (2):
      Sync headers with drm-next
      build: bump version to 2.4.120

Signed-off-by: Fabio Estevam <festevam@denx.de>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>