package/freescale-imx/imx-gpu-g2d: re-install headers to staging

Commit 44355f799805 ("package/freescale-imx/imx-gpu-g2d: install the
specific library for i.MX8MM") accidentally remove the headers'
installation to the staging directory. Fix that.

Fixes: 44355f799805 ("package/freescale-imx/imx-gpu-g2d: install the specific library for i.MX8MM")
Signed-off-by: Sébastien Szymanski <sebastien.szymanski@armadeus.com>
Signed-off-by: Julien Olivain <ju.o@free.fr>

package/freescale-imx/imx-gpu-g2d/imx-gpu-g2d.mk

@@ -26,6 +26,7 @@ endef
 IMX_GPU_G2D_SUBDIR = $(if $(BR2_PACKAGE_FREESCALE_IMX_PLATFORM_IMX8MM),mx8mm,)
 
 define IMX_GPU_G2D_INSTALL_STAGING_CMDS
+	cp -a $(@D)/g2d/usr/include/* $(STAGING_DIR)/usr/include/
 	cp -a $(@D)/g2d/usr/lib/$(IMX_GPU_G2D_SUBDIR)/libg2d*  $(STAGING_DIR)/usr/lib/
 endef