DEVELOPERS: add myself to configs/kontron_smarc_sal28_defconfig

Signed-off-by: Heiko Thiery <heiko.thiery@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
(cherry picked from commit ce38e455bb61ad2f4219a2c7da8b68d07dd0b180)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

DEVELOPERS

@@ -1231,8 +1231,10 @@ F:	package/volk/
 
 N:	Heiko Thiery <heiko.thiery@gmail.com>
 F:	board/kontron/bl-imx8mm/
+F:	board/kontron/smarc-sal28/
 F:	board/kontron/pitx-imx8m/
 F:	configs/kontron_bl_imx8mm_defconfig
+F:	configs/kontron_smarc_sal28_defconfig
 F:	configs/kontron_pitx_imx8m_defconfig
 F:	package/altera-stapl/
 F:	package/ipmitool/