ci: Shrink the arm64 kernel build a bit.

No sense building some of these subsystems for just testing the GPU.
Saves some container rebuild time and kernel contents to move around.

Reviewed-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/3928>

.gitlab-ci/arm64.config

@@ -62,6 +62,14 @@ CONFIG_ARCH_XGENE=n
 CONFIG_ARCH_ZX=n
 CONFIG_ARCH_ZYNQMP=n
 
+# Strip out some stuff we don't need for graphics testing, to reduce
+# the build.
+CONFIG_CAN=n
+CONFIG_SPI=n
+CONFIG_WIRELESS=n
+CONFIG_RFKILL=n
+CONFIG_WLAN=n
+
 CONFIG_REGULATOR_FAN53555=y
 CONFIG_REGULATOR=y