ARM: omap2: remove unused omap_hwmod_reset.c

Since commit 90aa4ed5 ("ARM: OMAP2+: Drop legacy platform
data for dra7 rtcss"), this is not used any more and can be
removed.

Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>