MAINTAINERS: remove obsolete OMAP HWMOD DATA FOR OMAP4-BASED DEVICES

Commit 2584d7e7 ("ARM: OMAP2+: Drop legacy platform data for omap4
hwmod") drops the file ./arch/arm/mach-omap2/omap_hwmod_44xx_data.c, but
misses to drop the now obsolete OMAP HWMOD DATA FOR OMAP4-BASED DEVICES
section in MAINTAINERS, which refers to only that file.

Hence, ./scripts/get_maintainer.pl --self-test=patterns complains:

  warning: no file matches  F:  arch/arm/mach-omap2/omap_hwmod_44xx_data.c

Remove the obsolete OMAP HWMOD DATA FOR OMAP4-BASED DEVICES section.

Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>