boot/at91dataflashboot: rename patches with the proper naming convention

As reported by check-package (by calling it directly):
use name <number>-<description>.patch

Output of:
make at91dataflashboot-dirclean at91dataflashboot-patch | grep 'Patching\|Applying'

Before:
>>> at91dataflashboot 1.05 Patching
Applying at91dataflashboot-1.05-do-not-install.patch using patch:
Applying at91dataflashboot-1.05-eabi-fixes.patch using patch:

After:
>>> at91dataflashboot 1.05 Patching
Applying 0001-do-not-install.patch using patch:
Applying 0002-eabi-fixes.patch using patch:

Signed-off-by: Ricardo Martincoski <ricardo.martincoski@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>