gen_initramfs: fix append_drm() modules lookup code

After generating the module dependencies for drm drivers, we
should pick up all the modules by looking at the whole kernel
modules directory path and not just at drivers/drm.

This has been reported in GitHub issue #17 for genkernel-next.

gen_initramfs.sh

@@ -788,7 +788,8 @@ append_drm() {
     rm -rf "${TEMP}/initramfs-drm-${KV}-temp/"
     mkdir -p "${TEMP}/initramfs-drm-${KV}-temp/lib/modules/${KV}"
 
-    local drm_path="./lib/modules/${KV}/kernel/drivers/gpu/drm"
+    local mods_path="./lib/modules/${KV}"
+    local drm_path="${mods_path}/kernel/drivers/gpu/drm"
     local modules
     if [ -d "${drm_path}" ]
     then
@@ -809,7 +810,7 @@ append_drm() {
     local mod i fws fw
     for i in ${modules}
     do
-        mod=$(find "${drm_path}" -name "${i}${MOD_EXT}" 2>/dev/null| head -n 1)
+        mod=$(find "${mods_path}" -name "${i}${MOD_EXT}" 2>/dev/null| head -n 1)
         if [ -z "${mod}" ]
         then
             print_warning 2 "Warning :: ${i}${MOD_EXT} not found; skipping..."