DEVELOPERS: add Romain Naour for am574x_idk_defconfig
The DEVELOPERS entry was missing.
Fixes: 35eb74c634 ("configs/am574x_idk_defconfig: new defconfig")
Signed-off-by: Romain Naour <romain.naour@smile.fr>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>