MAINTAINERS: Remove me from IDE/ATAPI section

It has been years since I've touched this and "this" is going away
anyway... any day now. :-)

So remove me so that I do not get CCed on bugs/patches.

Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20210412090346.31213-1-bp@alien8.de