configs/bananapi_m1_plus_defconfig: select custom headers
Board used custom Kernel but did not specify
custom headers. This broke the build when
Linux 5.11 was added in d2fe9c6.
Fixes:
https://gitlab.com/buildroot.org/buildroot/-/jobs/1089053980
Signed-off-by: Filip Skoneczny <fskoneczny@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit 76efcc2f548b307a821b8e4ab284a31a97b1c315)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>