Update MAINTAINERS for SanCloud devices and drop unused old Kconfig
* tag 'omap-for-v5.15/soc-signed' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap:
MAINTAINERS: Adopt SanCloud dts files as supported
arm: omap2: Drop MACH_OMAP3517EVM entry