xf86-video-imx-vivante: update PN to 6.2.4.p4.0

Note that the xorg driver was not changed in the update from
6.2.4.p1.8 to 6.2.4.p4.0. This rename aims to keep the PN across
the vivante components consistent.

Signed-off-by: Max Krummenacher <max.krummenacher@toradex.com>

diff --git a/recipes-graphics/xorg-driver/xf86-video-imx-vivante_6.2.4.p1.8.bb b/recipes-graphics/xorg-driver/xf86-video-imx-vivante_6.2.4.p4.0.bb
similarity index 100%
rename from recipes-graphics/xorg-driver/xf86-video-imx-vivante_6.2.4.p1.8.bb
rename to recipes-graphics/xorg-driver/xf86-video-imx-vivante_6.2.4.p4.0.bb