ARM: 9060/1: kexec: Remove unused kexec_reinit callback

The last (only?) user of this was removed in commit ba364fc7 ("ARM:
Kirkwood: Remove mach-kirkwood"), back in v3.17.

Link: https://lore.kernel.org/r/20210210235243.398810-1-joel@jms.id.au



Signed-off-by: Joel Stanley <joel@jms.id.au>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>