Partial revert "configs/olimex_a20_olinuxino: switch to extlinux.conf"

Old scripts are still used by a10_olinuxino & a20_olinuxino_micro

Fixes olimex_a20_olinuxino_micro
see https://gitlab.com/buildroot.org/buildroot/-/jobs/1478738568

Signed-off-by: Francois Perrad <francois.perrad@gadz.org>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

board/olimex/a10_olinuxino/boot.cmd

@@ -1,5 +0,0 @@
-setenv bootargs console=ttyS0,115200 root=/dev/mmcblk0p1 rootwait panic=10 ${extra}
-ext4load mmc 0 0x49000000 /boot/${fdtfile}
-ext4load mmc 0 0x46000000 /boot/zImage
-env set fdt_high ffffffff
-bootz 0x46000000 - 0x49000000

board/olimex/a10_olinuxino/boot.cmd

@@ -0,0 +1 @@
+../a20_olinuxino/boot.cmd

board/olimex/a10_olinuxino/post-build.sh

@@ -1,3 +0,0 @@
-#!/bin/sh
-
-cp $BINARIES_DIR/boot.scr $TARGET_DIR/boot/boot.scr

board/olimex/a10_olinuxino/post-build.sh

@@ -0,0 +1 @@
+../a20_olinuxino/post-build.sh

board/olimex/a20_olinuxino/boot.cmd

@@ -0,0 +1,5 @@
+setenv bootargs console=ttyS0,115200 root=/dev/mmcblk0p1 rootwait panic=10 ${extra}
+ext4load mmc 0 0x49000000 /boot/${fdtfile}
+ext4load mmc 0 0x46000000 /boot/zImage
+env set fdt_high ffffffff
+bootz 0x46000000 - 0x49000000

board/olimex/a20_olinuxino/post-build.sh

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+cp $BINARIES_DIR/boot.scr $TARGET_DIR/boot/boot.scr