kdump-steamos: Move configuration file out of /etc

This patch main goal is to "un-Debianize" the configuration file
for kdump-steamos - thanks Emil (@xexaxo) for the discussions; it
is with a bit of a heavy heart I do that, but let's comply with the
modern distros ;-)

We hereby put the config file in a more standard path: /usr/share.
Usually users could override that with /etc/ file, but not in this
case, or at least, not for now. Kdump/pstore is expected to work
quietly, with no users' interference. Advanced users might want to
play with the configs though; and those can just go ahead and edit
the /usr/share/kdump/kdump.conf - it's all documented in the README.

In the future we can improve that by having the override mechanism
with the /etc file, let's see if we have a demand for that.

Signed-off-by: Guilherme G. Piccoli <gpiccoli@igalia.com>

module-setup.sh

@@ -18,12 +18,12 @@ installkernel() {
 }
 
 install() {
-    #  Having a valid /etc/default/kdump is essential for kdump.
-    if [ ! -s "/etc/default/kdump" ]; then
+    #  Having a valid /usr/share/kdump/kdump.conf is essential for kdump.
+    if [ ! -s "/usr/share/kdump/kdump.conf" ]; then
         return 1
     fi
 
-    . /etc/default/kdump
+    . /usr/share/kdump/kdump.conf
 
     #  First clear all unnecessary firmwares/drivers added by drm in order to
     #  reduce the size of this minimal initramfs being created. This should
@@ -45,7 +45,7 @@ install() {
     echo "${DEVN}" > "$initdir"/usr/lib/kdump/kdump.devnode
 
     cp -LR --preserve=all /usr/lib/kdump/* "$initdir"/usr/lib/kdump/
-    cp -LR --preserve=all /etc/default/kdump "$initdir"/usr/lib/kdump/kdump.etc
+    cp -LR --preserve=all /usr/share/kdump/kdump.conf "$initdir"/usr/lib/kdump/kdump.conf
 
     inst_hook pre-mount 01 "$moddir/kdump-collect.sh"
 }