gma500-gfx-check: Fixes infinite calling to modprobe gma500_gfx

The previous script caused an infinite call to modprobe gma500_gfx on certain
situations, this fixes a typo and uses a new flag to avoid the infinite loop

(From meta-yocto rev: 9a341596fd0cdf892e125b2eead7b5e334a590b4)

Signed-off-by: Alejandro Hernandez <alejandro.hernandez@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta-yocto-bsp/recipes-bsp/gma500-gfx-check/gma500-gfx-check/gma500-gfx-check.conf

@@ -1,2 +1,2 @@
 # Mimic modprobe's install funcitonality with busybox's modprobe
-install gma500_gfx lsmod | grep gma || { gma500_gfx_check.sh || modprobe gma500_gfx; }
+install gma500_gfx dmesg | grep gma500_gfx_checked || { /etc/modprobe.d/gma500-gfx-check.sh || modprobe gma500_gfx; }

meta-yocto-bsp/recipes-bsp/gma500-gfx-check/gma500-gfx-check/gma500-gfx-check.sh

@@ -2,6 +2,10 @@
 
 # Check for devices we wish to avoid gma500_gfx for
 DEVICES="0x8119 0x4108"
+
+# Checked flag to avoid infinite modprobe
+echo "gma500_gfx_checked" >> /dev/kmsg;
+
 for DEVICE in $DEVICES; do
     if udevadm trigger --subsystem-match=pci --verbose --attr-match=device=$DEVICE | grep "pci" >> /dev/null ; then
         echo "Found $DEVICE, avoiding gma500_gfx module" >> /dev/kmsg;